I still play ME1 (PC) to this day... ME2 haven't touched since 6 months after it launched (got 5 Shepard's start to end), which I have eventually uninstalled. ME3, finished once, uninstalled and nuked Origin off my computer.
So yea, for me, ME2 and ME3 are not real games as far as I'm concerned. My only three minor issues with ME1 are:
(1) (if doing a new-new game) is the weapons aiming issue despite the fact that my guy is a N7 soldier... (IMO: they should have explained Shepard just came out from a major battle and has been out of combat for a few months, but still has the spirit they are looking for).
(2) For the entirety of the game, the loot glut; which unless you are saving up for the N7 weapons (that I care not to use), you can just stop picking up loot mid game.
(3) A few Mako maps; they could have used a bit more polish -- including level design and the fact that there was only 2 outpost designs.
Mass Effect (1), the real Space Opera. Shame ME2 and ME3 never lived up to that.