In all honesty, I would probably play Osu if the community wasn't terrible, the charts had much more consistency with each other (as well as being decent at the very least *cough*at-least-8-charts-of-Miiro-ranked*cough*), and if a lot of the system itself wasn't so terrible (ie. combo-based scoring). But y'know, Based Peppy would never do anything about it so :V
To be fair, I hardly interact with the community at all, but the other two points are quite valid.
...for standard anyways. Another map that was too often back in around 2010 was U.N. Owen Was Her, with remixes upon remixes of the song having maps. I haven't seen too much repetitiveness into Taiko or osu!mania, though osu!mania is terribly coded in it's own right. Combo-reliant scoring isn't honestly all that bad in my opinion, but it is handled somewhat terribly onto standard and CTB
The pp (performance point) system in the game is where it truly does flop though. In Standard, it is mostly reliant on combo, as stated before. Taiko overweighs easier songs (seriously 205pp shouldn't belong to a 4min 4.7 star song), but underweighs hard songs (again, 7.41 stars with a few misses on DoubleTime, Hidden, Flashlight, and Easy is only 614pp, more onto why this is silly later), though at least it isn't super reliant onto combo, it's more reliant onto misses and accuracy than anything. Also in Taiko, as the combo gets larger, the amount of points you can gain increases, but it only increases to a certain point, so a miss isn't exactly fatal for a high score anymore. CTB is kind of a copy-paste of standard when it comes to scoring and pp scoring. osu!mania, on the other hand, is its own beast. Max score is always 1mil, no matter what. Combo somewhat matters, but a high acc will usually trump a high combo. osu!mania doesn't detect if you hit a wrong key, only if you hit the correct key, or missed a key. It's dumb, but what's also dumb is the pp scoring system! For whatever reason, high star ratings break the pp system utterly. Example is the 7.95 star song MANIERA, where top mania players have S ranked (in Standard and Taiko it's FC'ing a song with good enough acc, in CTB it's gaining 98% acc or more, and in mania it's gaining 95% acc or more) and gotten over 1kpp just from this one song. Just...why...
This was probably either not indepth enough, or too indepth, but either way, yes the system is broken. It will always be the player's choice onto what maps they want to play however, and even if there's 8 or so MIIRO maps, you can skim past those to play more unique songs in the game. And as stated before, you don't really have to interact with the community at all, so thank god for that. Yes, it's community is shit, but don't let that part detract from the overall experience of the game. The complaint onto the combo-based scoring though? Totally understandable!