I really don't get all the hatred for the ending. I haven't done the "extended cut" ending yet, so I can't say if it's better/worse, but the ending that the game shipped with was bloody brilliant.
I waited till this game was $10 brand new to pick it up lol, so maybe my opinion is scewed b/c I didn't spend $60 hoping for my "dream" ending to the trilogy, but I absolutely loved the game and the ending.
Landed on exactly 500,000/500,000gs with exactly 18500 achievements and exactly 500 games. All 100% including DLC. Was going hard the first half of January to reach that goal! Finished it on 1-19-2016. Final achievement: Completion Serenity in Nero.