Hello I'm a CtB mapper who started CtB and CtB mapping in 2010
I've been feeling that CtB has its limitation of variation of patterns so everyone feels it's boring, because of the rules to make CtB as a 'Rhythm Game' make more high barriers for the patterns, and CtB has 4 ways of movements during the game play : left, right, left+dash, and right+dash. The mixture of 4 types of movements are making patterns, and these patterns are making total maps. It's not yet, but after some years when mappers realize the limitation of variation of CtB patterns, CtB is gonna be such copy-cat game with same or similar patterns in all maps over. At least I can see now most of maps' styles were almost same.
So yeah. I agree that CtB is really a boring game