I haven't read the whole thread, but 55 or so pages of it, so I have a rather good idea of what people seem to upset about. To me, it seems like most people want - or wanted - a nice ending like the endig to Star Wars or Dragon Age: Origins in which the big bad guys are defeated and all is nice and soft and well in the world again.
If - and I'll use this cautiously and deliberately - the endings we're discussing here are real or at least semi-real, it seems to me that Bioware has us make a choice - save the crew but at the cost of Earth or save Earth but as the cost of the crew. And then some endings in between, as I can tell from the 55 pages I've read. Shepard does what he have to do to stop the reapers - at all cost. I seem to clearly remeber the very first gameplay video or video developer interview in which Bioware ME3 devs. said this. And I thought to myself on, not again...
Warning: End spoilers for Planescape: Torment, Oblivion and Neverwinter Nights and Fallout 3 to come.
And by that I mean this: Maybe there's an ending in which Shepard will sacricise himself to save humanity, his crew or both. And while this ending certainly was edgy back in 2000 or 2001 when a little game called Planescape: Torment was released by now it has become overused and rather cliché, as I see it. It is like every game developer tries to emulate or do something similar to what PS: Torment did 12 years ago. However, in that game, this ending actually made sense. (The Name less One is immortal so he chooses to not live anymore - as I remember it).
And then Bethesda had this ending in Oblivion and in Fallout 3, while Obsidian in the NWN2 ending let everyone fall into a cave (I think?) thus setting the scene for the expansion(s). Does the end to NWN 2 sound a lot similar to what Bioware are planning or have planned for the Normany crew, e.g. marooned on a planet with no places to go. And that's if and when the rumours about the endings are true...
As for Shepard being together with his Love Interest (LI) can't see why this can't happen; LI and Shepard gets to go together on the last mission/quest in the game, either surviving it or dying from defeating the Reapers in a glorious battle. As I see it, people want what they call a good ending i.e. endings that restores the world order back to where it was before all this began. But, realistically and also in the game's universe, can you see this happening? And by this I mean that it'll be hard and difficult to go back to a place where you - or rather we the people on Earth - haven't met the Turians, the Salarians, the Krogans etc.
If the rumours about the endings are true - and to me they could be either be true or not - then the narrative structure ends with what is known as an open ending as opposed to a closed ending. A closed ending is one like the ending in Star Wars or Dragon Age: Origins, everything is neatly tied up and put in its proper place again - or as similar and reasonably as it can be. An open ending is one where this is not so. Dragon Age 2 has such a ending. There's a war looming and threathing. The Warden and the Hero of Ferelden are both gone and no-one has seen or heard from them. In short, we do not know, what'll follow next. To me, it sounds like the endings of ME3 (if true that is) build upon this - and are open endings.
To me, that is the best endings there are. It means that I, as a player, a reader, etc. get to use my imagination and guess what happens next untill maybe the devs. answer this. I also like dark, sinister end broody endings that doesn't end in - let's call it - an awards ceremony like in the Star Wars or Dragon Age endings. Not every game or book should have a closed ending - and ME3 probably is one of the games where an open ending fits it better (than a closed ending).