I am about halfway through The Witcher 2 and am loving it. I look forward to getting to the end after reading what you have said. I however, am one of the few that actually like ME3 and it's ending. Originally it was vague and had no closure, but I made certain assumptions(that I see as logical, mainly that the catalyst was a machine) about things and it led me to something very close to what the extended cut and leviathan DLC told us. The lack of closure originally was terrible I thought. I'm glad they gave us that eventually, and for free.
It's always funny to me that people claim ME2(it has the most watered down game play of the series) as the best in the series and the one that has the best ending. It easily has the best structured ending, but that's about it. Its entire story is interchangeable with anything else that would require recruiting such a team. Which some of the blame for that can be placed on ME3 for not acknowledging it, but ME2 gave us a VERY vague thing to go on(dark energy). The first game ended on the note of Shepard and Anderson realizing that if we want to beat the reapers when they show up that we need to unite. It's the last bit of dialogue right before the credits. So what happens in the second game? A brand new enemy shows up in the first 5 minutes from that random one of a kind huge relay that was never mentioned before. Then Shepard decides to go after said enemy for "killing" him/her and that saving remote colonies of his/her own species is more important than making the galaxy realize the reaper threat is real and uniting them. That is a very funny way of attempting unity. That is like a 180 in character, and/or being forced down a renegade path. Don't get me wrong, the story was great as its own thing, but that's it. It contributed nothing to the main plot the first game established aside from finding out that this random brand new enemy are actually re-purposed protheans from the last cycle.
I just never understood why the catalyst(a central intelligence that is dictating the enemy that is and always has been machines) was seen as so "out of nowhere", but no one seemed to notice that the entire premise of the second game is just as out of nowhere, arguably more so.
And then there is all the "space magic" comments that people made, which they are technically right, but the game told us it was from the very beginning. The reapers built the citadel and relays. Imagine how the galaxy would be without them, the chances of intelligent species being able to interact with each other is slim to none. Why would the reapers build something that would allow for the possibility of the galaxy uniting against them?(which is exactly what happened) Clearly something else is going on here. The science is there to back it up and is explained within the story itself and its characters are aware of it. I'm not sure why so many players seemed not to be though.
The crucible is said as being just an energy source on more than one occasion, so it's the citadel/relays that actually do the "magic" at the end. Those things that we stumbled upon that the story and its characters have admitted to knowing that they work but not being sure exactly HOW they work while also letting a race of benign aliens maintain the billion year old space station that we have made the hub of life in the galaxy. That is the enemy's level of control and it was established in the very beginning. I just never found it that hard to put 2 and 2 together even if it wasn't presented in the best of ways. Which obviously the writers agree with because we got DLC to explain more. Even then, nothing in the EC surprised me and the leviathan DLC felt sort of forced to me.
I just think that what we got is FAR better than the supposed "leaked original ending"(it was actually just one of several concepts that they were considering) simply because it questions how we advance technologically and the world we make for ourselves. I just find that to be far more interesting than what most people would seemed to have preferred(the dark energy plot), which equates to little more than a doomsday scenario that we had no real control over.