But we didn't get to see them doing their part.
Fan expectations were set by pre-release interviews with tons of information you can have a look at through the link in my previous post. Not one of these promises were kept. Essentially that makes it look like they either a) Lied or b) Rushed the ending.
The end is disjointed and does not fit with the running narrative, hints and themes of the 3 previous games. It's a lazy cop-out and just completely stupid.
I understand people that say they like the ending. I would be remiss if I didn't point out that the ending isn't even that bad for a standalone game (see Deus Ex: Human Revolution) but to be the conclusion of a trilogy? Absolutely not.
I like a nihilistic ending as much as the next guy, and fans (including me) aren't pissed off that there are "things beyond their control". They're pissed off because what is supposed to be an epic conclusion to a game trilogy about how "your choices matter" (an actual quote regarding the ending of Mass Effect 3 pre-release) leaves you with
no choice and leaves you wondering what the hell happened to any of your characters.
There is absolutely no closure and there are a million things wrong with it. Belittling it to:
you have to accept that there are often things beyond your control. it's not the first game that does this, nor the last one. and fans simply cannot accept it.
is irrational and unfair. There are a ton of reasons beyond the actual plot of the ending that make it a terrible ending. And that's disregarding the original planned storyline (about the reason for the reapers being that dark energy is destroying the galaxy) being tossed in the bin.
All that being said, I can respect that there are people out there who do actually like the ending. Kudos to them, because I wish I was among them. As it stands, to most the entire trilogy has lost it's replayability value, which sucks.
But what is pissing me off the most at the moment is people out there defending it to the hilt and refusing to acknowledge that the people who don't like it are pissed off for a reason. There are too many people just being totally ignorant and saying "zomg it woz so amayzing, BIOWARE dnt listn 2 dese haterzzz, tey just ddnt get it!!". Literally all you hear is how stupid you are for not loving a shit ending.