The only voice work I didn't really like was Trent. That was mostly because it was so obvious he was voiced by the same guy as Carrington.
I DL'd the game and did the first couple of missions and had a few online matches. It's all good. My only minor problems are the manual aiming seems trickier/fiddlier than it used to, Trent and Jonathans new faces, apparantly being unable to mix a main characters head with any torso in Combat Simulator and the fact the game doesn't tell you what Leaderboard crowns are.
The game shows you what the Avatar Awards and other XBLA unlockable are and it has these other icons in this ingame menu but it doesn't tell you what they actually are.
The Avatar Awards are unlocked by
Achieveing your first headshot
and passing any special assignment on any difficulty but I've no idea what that actually means. Any help?