I played it and finished. Unfortunately. I've been telling people that the game is like ending the original Star Wars trilogy with The Phantom Menace.
Also, Bioware really was lying about being able to get the best ending without multiplayer. Not possible at all. I imported a character that had been through the first and second games, collected all of the war assets, got all of the races to ally with me, approved all the Spectre clearance things, completed all of the side missions, and I was still short of the best ending.