Why does no one complain about Amumu?

really easy champ to play. You have 1 decently long really wide skillshot. I guess it's kinda slow but still pretty easy to land. Q or flash into a cluster of enemies, press R, and you just won the teamfight. Then just waddle around chasing carries and Q'ing them.
one of the easiest yet most game-changing and impactful champs in the game.
you can make fancy outplays while split pushing and 1v1s with
or
or
with a relatively high chance of failure, while really holding your team back if you cant make the plays or aren't ahead. Or you can just pick amumu, land a Q and press R and win games. hmm?
have not died in my past 3 games with him; insanely tanky yet bursty if built right. Even if i build tank i still end up doing ~2/3 the damage as my adc
why does no one complains about this guy?