Again, I'm not very far into ME3 but I wonder what people expected. Even a game like inFamous offered a lot of choices but how many endings could there have been? These games are limited by the creators. They have to record audio, motion capture, and everything else for these endings that 1/3 of the audience will never see. It's not like Chrono Trigger where you can just switch some text around. People may have come into this with unrealistic expectations. I'd love a butterfly effect where the drink I got at the bar in ME2 was the difference whether the universe lives or died but that just can't be the case.
*future me will likely side with all of the pissed of fans, though*