well i would like to give it to beast, actually my first ever loved character was beast, i always got mad at him losing fights and always got mad at him being the first x-men to go down, i started to like other characters more like wolverine and cyclops, but only after i grew up a bit i realised that his character is not about fighting its about all the other things he can contribute to the team, his intellect his story his character and his love to others, now i know majority of the times the writers doesnt care about developing his story and just make him some blue guy that gets knocked around a lot, but a true comics fan will realise who beast is and realise that even if not a great fighter by nature he is still a great character without being the ass kicking guy
as for beast the fighter, he is very agile strong and dangerous when he is in a rage mode as we saw against wolverine and against danger, however it takes away from his character and he becomes another animalistic character and we got tons of those, so his potential is to be able to beat the likes of bane and such but not on the expance of his character, i actually loved how they portrayed him in "sabretooth: red zone" , he gave creed a very good fight demonstrated nice agility and strength and still was in character