The most irritating thing for me? From the very start until the last 15 minutes I honestly thought I had in my hands one of the greatest gaming experiences of all time. The writing was dramatic and tense, all at the right times. There was some good humor. I even thought they got the mechanics tied down (except for the inclusion of MP having an impact, be it used or not, in the SP). Music was perfect, voice acting, even from Meers who most certainly isn't bad, just a little, wooden maybe at times, was top of the line.
Do you know what, I get the need for a bad ending. There can be no "good" ending to the massacre of countless billions. But an ending that resulted in my Shep actually getting off of the Citadel, back to a devastated earth, with representatives of all the fleets, with my LI, celebrating the end of the extinction cycle? Whilst I don't consider the actual game endings to be fine, it would have been more acceptable on another playthrough.
Whilst I most certainly don't feel cheated like I did with DA2, mainly because the game was spot on for me until the end, I do feel let down that 3 games worth of fighting, choosing, and more fighting, was, ultimately, for nothing.
Shep - "Can you help me?"
Boy thing - "I suppose. I control them. But why should I? Throughout all cycles we have witnessed, organics all end up marveling in their superiority by creating synthetic life, The created will always turn against the creator. We are the solution to this problem"
Shep - "But the geth and quarians.