I got this game for $20 a few months back. Played it for over 100 hours. It was better then ME 1. But somewhere in between that and 2/3. Honestly it's not a bad game. The combat and the Mako are the best the series has ever had. The exploration is entertaining enough and the characters aren't as bad as I thought they would be.
Yet again the hype/hate train has killed another great game. In my opinion very underrated and definitely worth $15.