See your problem is playing ME3 first...
To understand how the fans felt play the entire series and then experience the kick in teeth vanilla ending. I am very thankful to the fan outcry despite how "entitled" many haters think they are; the fact is that the complaints garnered content that for the most part fixed the ending and made a much better game.
As for Mass Effect 3 as a whole, it's not the best in the series but it's a good game and could have been so much more.