I've been sort of quiet on ME3's (not that I am by any means an expert or an authority) ending. I really like and genuinely care about this series...
What bothers me so much about the ending (spoilers) aside from the fact that none of the choices I made in previous games mattered, was that the end cut-scene was so truncated. Seriously?!?!? Joker and EDI or Joker and Garrus (depending) walking out of the Normandy and some old creep talking to some little kid years in the future? THAT'S IT??? I would have appreciated a longer cutscene depicting the aftermath on earth and the fate of the characters (Miranda crying over me!). I mean, I like that they let you talk to past crew members before the final push towards the beam but...ugh. Its like they just....stopped.