I had kept hearing the outrage about the ending, but convinced myself maybe people just didn't get it. Having now seen it...yeah...I have no idea how this ends up being the end to this franchise. The whole premise of Bioware games for a long time now has been your choice matters...and in the biggest of them all, it doesn't. Yes the theme of the game is sacrifice, but it's also hope. The sacrifice part is taken care of with millions of people dying enroute to Shepard reaching the Catalyst. Whereas the hope part is shunted off to a destiny vs free will arguement, where destiny wins out. I felt it coming about halfway through EDI's storyline about gaining conscience.
So we're left with basically our Shepard going "Oh...so everything I've done over the last few years didn't really matter at all?" It's an interesting concept for a reveal, that the reapers are the ultimate failsafe to protect organic life. It's a twist that certainly is novel, synthetic life being the ultimate protectors of organic. But they don't use that at all, in my mind a better idea would be to say, "we don't need your protection or your patronization". The destory ending is not that, it's a selfish renegade ending that doesn't appeal to the rational mind. The control ending is a hodgepodge of ideas that don't work together. Why in the world would my Shepard, who fought her entire life to protect people and find a rational middle ground to every conflict, suddenly decide she needs to be play god and become in control of forces who in her mind don't need to exist in the first place. As far as the synthesis ending... It's really the same as the human-reaper, it's an abomination that completely misses the point. In my opinion that's the worst ending, it's electing to become gods when again that's not what any of this had been about. It had been about breaking the entire cycle of "gods".
To me, the synthesis ending shouldn't even exist, it should of been replaced with a rational ending where Shepard engages in a debate with the Catalyst and convinces it that it's wrong, or at best has no real way to ultimately predict that will happen with 100% certainty.
It just feels so cheap to destory the entire world no matter what choice you make. Take Kelly Chambers as an example, you have to go out of your way to save her two different times, yet ultimately she dies anyway accomplishing nothing of note. So why does it even matter if the collectors liquify her, or she gets shot in the face by Cerberus...it doesn't. You put so much work into the resolving the Quarian and Geth conflict, only for it to not matter at all, or for you to be a hypocrite after just proving synthetics could coexist with organics by then immdiently destroying them. That right there should be something you should be able to discuss with the Catalyst. To use as an example of how a rational mind and a strong leader can alter destiny and create free will.
That's what this had been building up to, the reapers represented destiny, and Shepard represented free will, an unknown variable capable of breaking the mold. Anyone with even basic comprehensory abilities could see that, and while you can technically break the cycle, you only really ever delay it. In control, Shepard basically takes the Catalysts place as the commander of the reapers, and if it is right, then eventually Shepard will have to start the cycle again to preserve organic life. Or in the destory ending you doom organic life just the same, only by delaying it however many thousands of years. Synthesis tries to be a middleground, but does it by violating some pretty serious moral boundaries, it again gets rid of choice, you make everyone a hybrid regardless of if they want to or not, because it's "best for them", when again the whole point of it is that the individual decides what is best for themself.
I'm just incredibly disppointed, but I want to see how they continue this. They say our ME3 data will be used for another game, implying there's a future for the series. But no matter what ending you chose, that future will have to be in the far far far future with very limited travel ability since FTL travel is impossible without the mass drive technology.