Just finished the game proper.
Near-perfect game in my eyes. Not 5 stars, not 10/10, not 100 Metacritic score because there are things here and there that stop it from being the best game evar. Most the positives I absolutely love about it, people have mentioned before: things carrying on from ME1 and 2, super tight combat system (besides the newfangled dodge-roll and the terrible one-button-does-everything for PC), more customisation and choice that reflects RPG values.
Now the endings: I understand the rage, but I don't align myself with it. Sure, the execution could have been handled far better, a lot of ideas being suddenly thrown around that were barely hinted at before (ie. ending seems like part tonal shift, part shoehorning a tangent), but at the same time: the fundamental concepts behind it are... actually not a bad idea.
It just seems that people aren't willing to take the time to open their minds to the possibilities, and think about the potential ramifications without the game dictating it to them (although iirc the game actually does dictate the ramifications before the choices are made).
I don't think the ending ruins the Mass Effect franchise forever, nor does it invalidate everything that Shepard's worked up to at that point. Because if Shepard didn't do all that stuff, how could they have worked up to those different solutions? At the end of the game, players have to ask themselves: what are the significant things that have changed in the galaxy, and what good could come of this? I think so many people are angry to the point where they oversimplify things into hyperbole out of rage. Sure, there were "three different-colored explosions". But then again, at the end of Mass Effect 2, Anadius was colored either blue or red.
It does certainly make emotionally identifying with the ending difficult when it all tends to be "greater-good" stuff that doesn't tell you a lot about the implications. As for the clamour for a different ending - part of me wants them to continue with what they have. I don't have the creativity to think of how they'd continue with that, because the endings certainly do have a finality to them, but I would think there are ways of giving answers that don't involve Shepard, or completely changing the plot of the ending.
So yeah - love the game. Wouldn't have missed the experience for the world. There are things that could have been much better, of course, but imo this is a finely crafted game. Very strong contender for my personal GOTY, although considering the line-up we know about so far, there's not a lot to contend with. =P