Graphics aside, obviously. Note that i've never played it before 2012.
So, i've ben playing Mario 64 in short bursts (15min. here, 10 min. there, etc.) wen i've had the time.. and i cannot get the complaints about the controls and the camera. To me, they feel good. Not great, mind you, but good. The controls are solid, intuitive, i can easily jump with accuracy anywhere. I can slow down wen i want to, i can run wen i want to, and so on.
The camera is fine aswell, i never had a problem with it, it's almost always were i want it to be, and wen it's not, i can move it around until i get a satisfying position - actually, i think the camera is far better than the one in Banjo Kazooie because i think it's better designed.
There's a crap ton of content to play with aswell.. the framerate is rock solid.. Honestly, i think that it's one of the few on the N64 (i'm not a big fan of the N64) that not only aged extremely well, but it's fun as hell to play.
Sure, Galaxy is far better, but these are completely different games. Different level design, different sound design, completely different all around. Just because Galaxy (or Sunshine) exists doesn't mean Mario 64 isn't worth playing.