Maybe I'm just not looking in the right (wrong?) forums, but I haven't seen much of a division here. Many, MANY occasions of peope talking past each other, but no real division. Plenty of threads saying that having high expectations is not the same as being entitled, but very people people actually calling others entitled. Plenty of people saying that ME3 is terrible and that people should stop encouraging low standards by saying it had a satisfying ending, but very few people actually saying they found the ending satisfying. Most disturbingly, penty of times one person's said somethign like, "well, that was boring I certainly didn't enjoy that," and somebody else has jumped on them for not hating the game and everyone who had the slightest hand in developing it. Both of these people thought the ending was poor, why not team up to do something about it rather than turning that dissapointment and anger onto each other?
Mostly people have seen that one guy who didn't enjoy the ending and started a lawsuit against Bioware (a lawsuit which, may I remind you, takes a stated fact of 'this specific thing WIL NOT HAPPEN' from the marketing marterial and points at the moment that thing does happen in the game. I'm not saying the lawsuit's the first solution, but it's not entirely without merit) and assumed that everone who doesn't like the ending is this extreme.
The only direct cause/effect I've seen is people picking on Zeel because (s)he dares to voice an opinion without screaming "Disclaimer! Discalimer! Only my opinion you can't tell me I'm wrong! Don't hit me!" after it (a practice which seems to warrent the death penalty around here, but that's a topic for another thread). On the other hand this did spawn the, "Brace yourself, Zeel is comming," picture so hey, I got a laugh out of it.
Incidentally, I hope everyone here's aware of the massive double standard in this forum: why is it entirely fair to mercilesly rip apart Twilight's story, yet nobody can critisise Mass Effect's story? Because here's food for thought: purely objectivly, Twilight is better. There are very few plot holes (admitedly a few fairly cheap expination to stop them, but the explinations are at least there), most character development neccesary for the final scene occurs two entire BOOKS before it and wasn't just inserted in after the author wrote the scene but needed something put in earlier to avoid sudden reveals, and you get a chapter at the end that gives some closure for each character. Neither are perfect, no way am I arguing that, but only one of them follows the rules that high-school creative writing students are taught.