Instead of talking about the ending, I want to bring some positivity to this thread:
- The Reapers were pretty much depicted as these powerful death machines. I liked that Bioware didn't soften them up.
- The Credits song by Faunts. A really nice mix between the M4 and ME2's credit song
- Liara's Goodbye sequence. Amazing moment
- Landing on Mars and being accompanied by that Mars music were simply incredible. One of the highlights of the trilogy's OST.
- A View of Palaven is also pretty goddamn great
- Shooting it out with Garrus on the Citadel
- Garrus knowing his shit about calibrations versus Legion
- Jarvik joking with James
- The art styles and locations throughout the game. Astonishing.
- The London sequence being in contrast to the colours of the earlier levels
- Seeing Grunt make it out of it alive (cliché as it may be)
- Legion's and Mordin's self-sacrifice
- Normandy was very war-like and really fit the whole "in war" situation
- Character creation music almost as good as ME1's CC music
- Drunk Tali
- Jarvik being cold and ruthless
A lot of fan service throughout the game, but looking at the investment people have made into 1 and 2, I wouldn't have it any other way.