Overrated:
Steel Vengeance: It was a stellar ride by any measure, but I felt like it spent so much time trying to always be doing something that it failed to capitalize on its size. I only got one lap on it, so perhaps my opinion will change down the road, but for now, I'm not even sure if it's the best ride in the park, let alone the world.
The Voyage: Somewhat similar to Steel Vengeance in that it felt like it tried to do so much that it wound up just coming off as overkill. It probably didn't help that it was rough when I rode it.
The Raven: Poor Holiday World. Two rides on this list is a bit rough for a park with as limited a coaster collection as they have. I just thought it was a fun little ride, but pretty middle-of-the-road.
SheiKra and Griffon: I've ridden the three US Dive Machines. These two were quite bland. Those vertical drops are great, but the thrill of lingering over the edge on the first drop hardly makes up for the fact that these rides are generally B&M hyper coasters without just about everything that makes B&M hyper coasters great.
Raptor: Sure, it's a solid coaster, but it just doesn't have the punch I wish it did.
Diamondback: It's one of the most bland B&M hyper coasters in existence. Solid, but unremarkable. I feel like it lacks any specific aspect that gives it character.
The Beast: It's fun, sure, but there really isn't enough going on for me to understand why this ride gets the love it does, even at night.
Mind Bender and Shock Wave: I'm doubling these up as well due to similarity. They're fun, but I can't for the life of me understand why these get the love they do. I especially like that Mind Bender has a layout amidst its inversions, but they're just pretty meh.
Underrated:
Batman - The Ride: I'm sure everyone wishes I'd probably just shut up about these clones, but they truly are absolutely spectacular and probably the best looping coasters on the planet. That brutal intensity is exceptional.
Flight Deck (CGA): Batman - The Ride with a little less is still more than most inverts could ever hope to be.
Silver Bullet: I really expected this ride to be bland. I found it to be quite the opposite. It's got plenty of kick, and the finale is really, really good.
The Legend: Holiday World's best. This ride did absolutely everything right. My #3 wooden coaster.
Intimidator: I don't know if it's the dive-bomber second drop, the high-speed turnaround where most of its peers just did standard hammerheads, or just the great memories I have of Carowinds, but if one is curious what B&M's best ride is in the 200-299-foot range, this one deserves a nomination.
Nitro and Silver Star: Listed together for similarity, I feel like both, despite having respectable fan bases, get a lot of undeserved flak. They have all the airtime of later installations, but with some non-air maneuvers (Nitro's helix, Silver Star's turnaround, etc.) to keep things interesting. Two of the best hypercoasters in existence if you ask me.
Goliath (SFMM) and Titan: Great speed and ridiculous intensity. No, they aren't particular strong in the airtime front, but they didn't try to be. Speed and positive g-forces were the orders of the day, and these rides delivered well on both counts. Two of my favorite hypers out there, with Titan especially so.
Valravn: I expected this ride to just be a slightly less bland version of the same bland coaster style. I was sorely mistaken. B&M finally delivered a Dive Machine worthy of high praise with this one.
Racer '75: Weird choice, I know, but with the retracking this baby got, it is one heck of a fun ride.
Cheetah Hunt: No, it isn't Maverick, but it is still one heck of an incredible ride. It might even be my favorite at Busch Gardens Tampa. Fight me.
Rock 'n' Roller Coaster and Space Mountain - Mission 2: Okay, I think the Paris version of the former somehow lacks the mojo of its Orlando counterpart, but these rides are friggin' outstanding, and yes, I rode Space Mountain - Mission 2 with the old restraints.
Hydra - The Revenge: No, it isn't the most intense, but the vast differences between it and the formulaic floorlesses that make up most of B&M's catalogue for that coaster type made for a refreshing change of pace, even if I still prefer most of those to this one.
Bizarro: On the one hand, it might be THE most generic floorless B&M ever built. On the other, it's one of the most aggressive.
Any Boomerang with the new trains: Flying Cobras? Speed of Sound? Hey, these are actually pretty fun!