I found the ending of the game (and therefore the trilogy) to be a poor one. Whichever you choose, you see largely the same things, your work is largely negated, the galaxy is horribly screwed up, and you have possibly become a massive hypocrite. Some of these things could be mitigated depending on what you have done, but my issues with it remain as stated.
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For instance, I managed to bring the Geth and Quarians together and establish what seemed to be the foundations of peace (along with punching a Quarian admiral and kicking him off my ship). The Geth also became true, free-willed AIs as a part of this. I talked with EDI on a regular basis and basically guided her to as-close-to-true-humanity-as-possible and helped her understand free will and what to do with it. Then comes decision time... Destroy or Control all Synthetics! So I fought hard to get the Geth accepted as a race and gave them complete sentience and free will just so I could wipe them from the galaxy or take over their minds? I totally accept there are consequences to my actions, but choosing either of these makes me a terrible hypocrite.
Or I could choose Synthesis and fuse all Synthetic and Organic life... which negates my work for each species' right to live and the work I have done to protect each race of the galaxy.
Then there's the destruction of the Mass Relays (which happens no matter what ending you choose)... When the Alpha Relay was destroyed in the Arrival DLC, it wiped out a solar system and every single living thing in it. That was one plain relay. Destroying all of them should devastate the galaxy and leave most inhabited systems a wasteland, thereby causing even more death and destruction than the Reapers. And even if the catastrophic effects were somehow negated by the Crucible, just obliterating the relay rather than causing it to blow up, it still leaves the entire galaxy without the one effective way to travel through the galaxy. It was established that FTL travel is not really workable for Organics and replicating the relays is beyond the scope of their skill. So now everyone is stranded in whatever section of the galaxy they happened to be on when the relays went boom, assuming they even survived.
And there's the whole weirdness with the Normandy crashing on some unknown planet, which happens no matter what and there is no explanation for why they seemed to go through the relay just before it went kablooey.
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So, yeah... Not happy with the ending. It felt like it invalidated much of what went into the series over the years.
The reaction I've seen elsewhere has not been surprising, though the amount of vitriol spewed at BioWare has been uncalled for. And the whole business with the FTC is just plain silly. I'm hoping they will listen to the displeased fans and release something more on-par with the rest of the game in terms of sheer awesomeness. And I hope it will be free, but I doubt it, thanks to EA's DLC strategy of charging for every single little thing...
All that said, I still loved the game. The story was riveting and powerful and filled with too many awesome moments. Going up against the Reaper on Tuchanka and calling in Kalros to take it down was one of the coolest scenes ever! Going to Rannoch and watching the Normandy dodge fire from both sides to reach the Geth Destroyer was gripping. Bringing in the combined might of damn near every sentient species, all to make that final assault with the Crucible was beyond amazing.
And saying goodbye to so many characters was really heart-wrenching for me... I played my import from ME1 and 2 and had made it out of the Omega-4 Suicide Mission with everyone still alive and kicking. I had really come to like each of them and saying goodbye was really tough. I'll admit I shed tears several times during the game.
I'm not sure when I'll play through it again... At the moment, I've been hitting the multiplayer and really enjoying that.
