Being in the north east of England, FL is my local park (I don’t count LWV any more, sadly…).
I do feel FL is underrated in a sense - the zoo is prettty good (better than e.g Drayton Manor) and it does have a large and diverse selection of rides on paper.
For families, the combination of kids flat rides, family coasters (Zooom, the Twistosaurus and the Mine train are pretty decent for that level) and the zoo make it a really strong park for kids and families.
For thrill seekers/people on this message board however - none of the “extreme” roller coasters stand out in the way e.g Icon, Nemesis, Smiler, Wicker Man do. There is no flagship coaster to make you wish to return to FL.
Kumali is arguably the best but Odyssey down the road at Fantasy Island is a better SLC.
Velocity is unique in the UK and well worth a ride but it’s not going to make you come back to the park.
Mumbai Jumbo is a solid enough ride but it’s kind of an evolution of a wild mouse really? It’s not one you really wish to jump on again.
Hero is among the most dull coasters in the UK. I haven’t found it painful just rubbish.
I’d honestly rather visit Fantasy Island for Millenium and Odyssey than bother with FL for thrill as it stands, let alone BPB or AT (if staying in the north).
Hoping this new one eventually opens and as previous posters have noted - it does not matter too much if it is a Collossus clone to the general public as they are different catchment areas. It should certainly be the best coaster at FL if and when it eventually opens. I hope to ride it this year!