If Mass Effect 3 had a terrible ending, that doesn't necessarily make the game bad. I never played it, so I can't judge. What sank Bioware for me was the one-two punch of a terrible rush-job cash-in Dragon Age sequel and an absolutely abysmal waste of what could have been a great singleplayer follow-up to a fantastic singleplayer series on the execrable "Star Wars The Old Republic".
I never thought I'd see the day, but I've now written off two of my most favorite developers of the past, Blizzard and Bioware. My how times have changed.
“The greatness of a nation and its moral progress can be judged by the way its animals are treated.” - Mahatma Gandhi