Right, I've now had a proper think about this topic after visiting some new parks and rearranging my list a little. I'm very indecisive, so I quite often reshuffle my list. I have actually ranked all 65 coasters I've been on, but I never really tend to touch the bottom of my list that often, so after having a proper think, I decided to have a little reshuffle of my bottom couple of coasters. So, without further ado, here are all of the coasters I have rated as a 3/10 or under (I'd say this is when I start to not really be a fan of the ride), which spans from #50 in my rankings right through to #65:
Matt N's Least Favourite Coasters (rated 3/10 or lower):
50. Speed: No Limits (Oakwood) - I did actually really like this coaster when I first went to Oakwood in 2016, but when I rerode it in 2019, I found it quite a lot rougher and really not very enjoyable. 3/10 (1.5 stars)
51. Dragon Challenge - Hungarian Horntail (Universal's Islands of Adventure) - Out of the 14 B&Ms I've ridden, the Dragon Challenge duo were my least favourite by a considerable distance, unfortunately. I didn't get to experience them dueling, but I found both layouts quite weak and I thought they were both oddly rough and uncomfortable. I can appreciate why many miss this coaster, but I was the side of the community that wasn't particularly sad to see Dragon Challenge demolished; Hagrid's looks far better, in my opinion! 3/10 (1.5 stars)
52. Dragon Challenge - Chinese Fireball (Universal's Islands of Adventure) - As above, but I found the Chinese Fireball side rougher; those Immelmanns in particular were pretty jolty, in my opinion! 3/10 (1.5 stars)
53. Saw: The Ride (Thorpe Park) - Saw is admittedly intense and has quite a dynamic layout, but I think that almost functions as the ride's downfall. I found it to be very rough, and I think I may also have found it a bit too intense for my tastes in portions; that post-MCBR section without any braking is a particularly uncomfortable sequence of elements if you're not expecting it! 3/10 (1.5 stars)
54. Rita (Alton Towers) - Now, I find my relationship with Rita quite sad, as I used to hold it in very high regard when I first became an enthusiast; it even had a brief stint as my #1 coaster! However, I'm not a fan of the restraints and I found it very rough when I last rode, although that launch is still pretty good! 3/10 (1.5 stars)
55. Vampire (Chessington World of Adventures) - Unfortunately, I'd say Vampire is one of the most underwhelming coasters I've been on. Before riding, I'd heard that it was a brilliant family coaster, and that it was one of the best coasters in the UK, but when I rode it in 2014, I found it to have quite a few dead spots, and I thought it was quite rough. Admittedly, I last rode Vampire 5 years ago in 2014, so a reride may be needed. On the positive side, there are some intense sections and the way it swoops over Transylvania is nice! 3/10 (1.5 stars)
56. Colossus (Thorpe Park) - For years, I said that this was my least favourite coaster. But when I actually think about it, I don't actually think I disliked Colossus as much as some of the rides above it, so I've moved it up slightly. Despite that, I wasn't a fan of Colossus at all when I rode. I found it extremely rough, and as with Rita above, I'm not a fan of those restraints. On the positive side, however, the landscaping is lovely, and the layout itself isn't bad; I wonder how Flamingo Land's upcoming equivalent with lap bars will be rated? Also, as with Vampire, I haven't ridden Colossus since around 2014, so it may need a reride, especially as they've allegedly changed the wheels and made it smoother. 3/10 (1.5 stars)
57. Grand National (Blackpool Pleasure Beach) - I can understand the appeal of Grand National, as it's actually got a lot going for it layout-wise. But I personally found it excruciatingly rough when I rode last year, which is why it's presently my least favourite wooden coaster. On the positive side, the layout itself is good, so if Blackpool ever retracks it or gives it new trains to make it less rough, I imagine I'd enjoy it far more! Also, I must admit I'm probably being too harsh on it, as it's 84 years old and a real icon for the British industry. 3/10 (1.5 stars)
58. Big One (Blackpool Pleasure Beach) - I get that the Big One is tall, fast and iconic, but I wasn't a fan of it, unfortunately. I thought it was surprisingly rough; very, very rough, in fact. I also don't think the layout is quite as interesting as that of Grand National, so that's why it's ranked slightly lower. On the positive side, however, I still admire the Big One for what it did for the British industry, and that first drop is quite something. I'm also probably being too harsh on it, as it was one of the first hypers. 3/10 (1.5 stars)
59. Scorpion Express (Chessington World of Adventures) - I didn't dislike Scorpion Express because it was rough, more because I remember it being extremely slow for some reason. Having said that, I last went to Chessington in 2014, so it may warrant a reride, especially considering that I liked its apparent clone at Thorpe far more. 2/10 (1 star)
60. Steeplechase - Right (Blackpool Pleasure Beach) - I appreciate Steeplechase for its uniqueness, and I'm very glad it still exists, but I must admit I wasn't a fan of its ride experience. I found it very jerky, and I found the riding position somewhat uncomfortable. Still, I'm glad it's still kicking around. 2/10 (1 star)
61. Creepy Crawler (Oakwood Theme Park) - Now, Creepy Crawler was my first ever Pinfari coaster, and I can't say my expectations of it were high. However, I unfortunately can't say that it exceeded my expectations either; while it was initially smoother than expected, it became extremely rough by the end, and it was one of those coasters where you could feel every join in the track as you went over it. I also thought that it was somewhat slow (although that's probably me being nitpicky, as it is for families) and that the cars lacked legroom; I bashed my knees very hard on the front of the car hitting the brake run! On the positive side, however, the queue is really nice! 2/10 (1 star)
62 & 63. Primeval Whirl (both sides) (Disney's Animal Kingdom) - These two coasters are the only two Reverchon spinners I've done, and I can't say they exactly left me with a positive impression of the ride type. I must admit I'm not really a fan of wild mouse coasters in general, and these ones seemed extremely rough. Although having said that, they were marginally smoother than another wild mouse that I'll come onto in a second, on the positive side... 2/10 (1 star)
64. Rattlesnake (Chessington World of Adventures) - Now, my memories of Rattlesnake are a little more vivid than those of Chessington's other coasters, but for the wrong reasons. I found this coaster absolutely agonising; the brakes were very sharp, and the laterals were extremely painful; let's just say that my arm was bright red when I came off. On the positive side, however, the setting and queue are nice! 1/10 (0.5 stars)
65. Infusion (Blackpool Pleasure Beach) - Oh dear. It would seem we've finally reached the very bottom of my coaster rankings. Infusion is currently the only Vekoma SLC I've ridden, and let's just say it did not exceed my expectations! I sat on row 2 to ride this coaster in the hope that it might not be too rough, but the head banging was the most relentless and painful head banging I've ever had on a coaster; my ears were bright red when I came off. On the positive side, however, the SLC layout isn't bad, and the ride looks nice with all the fountains under it! But if you're ever in a rush to get the credits at Blackpool, I'm afraid this is the one to skip unless you have an extremely high roughness tolerance. 1/10 (0.5 stars)
Do bear in mind that this is entirely relative; I try to enjoy each and every coaster for what it is, and one of these is certainly preferable to not riding a coaster at all! I just didn't enjoy any of them as much as the rest of my count, and they're not the ones I'd rush to in a park.