Even now I'm so disappointed with the way things turned out. It's really not that difficult to make a final A grade game for a trilogy. (Especially when the previous two were.) I just don't understand how the third game could get so messed up. After ME3 I went from being a huge fan, to just a fan. Also, multiplayer hurt this game a lot too.
Multiplayer saved the game. It was like pulling teeth to finish a lack luster SP campaign when MP was so much more fun. So yes I agree SP was easy and boring, but MP is awesome and has cemented itself in every future ME game. I can only hope that they can mix MP and SP in the future as well. Not as a requirement, but rather an option.