I don't like credit based upgrades - I enjoy "training" a weapon to unlock its full potential. Why yes, I do enjoy the occasional JRPG, how could you tell?
But buying them from the off just feels like I have very little advancement
But this is in, not out, so on topic:
A multi-view story that actually comes together, a la MW (Black ops did this, but for some reason I didn't enjoy it as much), spec ops a la MW2, NPCs I actually care about (Bowman, Dunn, Foley and Woods can all jump off a cliff. Actually Woods wasn't that bad, but at some point in Bay o' Pigs, he fires off hand at a door, and it opens to have two guys drop through, dead. For this, he deserves to die)