Jodi- new girl! Nice to meet you, glad you're on the show!
Just a comment at 10:00ish Legion sacrificing themself to make all Geth people was more complicated than was stated, and I actually didn't totally like it at first. While I think (and thought) that Geth were people too, Legion established that the Geth wanted to "build their own future". Legion was taking the future the Reapers gave them by integrating the Reaper Code into the rest of the Geth, and so that seemed out of character. However, I did come to accept it as a "the rewards are too great to NOT do it".
Also, new planet scanning was so cool! I was ninja'ing through, avoiding Reapers, hit and run. I enjoyed that so much! It really added to the feeling of the game.
As for what I did at the end was try to shoot the God Child, and then I choose synthesis. I had to, because I could not kill EDI and the Geth, and I'm spiteful and refused to accept that TIM was right. It seemed to be the best of several bad options.
As for the "best renegade ending", it seems to put a lot of credence to the indoctrination theory. The burnt likely-Shepard looks like the burnt and cracked skin were from the Reaper beam as opposed to "hey, I fell from space".
I also interpreted the Anderson extra convorsation as a "tugging on heartstrings" as opposed to "oh, Shep is gonna live in this ending".
And I really want some form of ending DLC. It's not that I want cake (well, I do because cake is yummy), it's that I want some form of actual closure after my huge investment in the series.
This train-of-thought message is brought to you by Toombs!
EDIT: Also, (unless you follow the Indoctrination Theory) the ending seems to be completely opposed to the themes of the series as a whole and even the themes of the rest of Mass Effect 3.