Of the following sci-fi franchises, who's ending do you think has pissed off its loyal, dedicated fanbase the most:
C. Altered ROTJ
Hmm, we're still in the middle of the ME3 hate-storm, but I'd give it the edge because the developers have indicated that they're open to changing the ending in the face of the backlash against them. I know that those Trek finales were retconned somewhat in the novels, but those were written by different people.
What makes ME3's ending so toxic to fans is that the games themselves are so amazing. Mass Effect 3 is a fantastic game, even with that ending I would still recommend it to anyone that enjoys great space opera, it is an experience like few others. I laughed, I held back manly tears, I felt a true bromance with a Turian named Garrus. So the fact that they dropped the ball in the last five minutes, then tripped and broke their own neck, it's not only disappointing, it's utterly incomprehensible.