What I'm hearing from people who have finished it is 'great game, lousy ending(s)' and no-one is thrilled with the day one DLC incident.
Overall, though, my impression (As someone who hasn't played it!) is that as long as you don't mind the ending(s), you'll probably enjoy the game.
EDIT: As an addendum to Alrik's comment on the problem with metacritic trolls, I'd like to add that most of the people adding very HIGH scores also appear to be trolls. For some reason ME3 has become the epicentre of a metacritic troll war. Genuine reviews seem to be in the minority, sadly.
