I loved it. Not the deepest gameplay and could have used a few more powers. Not sure how/why Jack was so good with weapons but it looks amazing, has a stellar cast, and stays pretty fresh.
I have all of the Achievements aside from a hardest mode playthrough. Was working on that when I got my One X but I got distracted by Halo MCC.
Solid 8/10 upper echelon title that should have sold better imo.