I've always hated the intro video to Crysis 2 for this reason: it shows Alcatraz jumping off a building, landing in front of a CELL trooper, GRABBING HIS GUN, and the proceeding to KICK HIM INTO A WALL. And yet you can't do either of those things in Crysis 2.
At least for campaign, it would be nice if these two features could be implemented for Crysis 3. (not multiplayer, that'd just be crazy unbalanced)

I loved kicking in Dark Messiah, and the weapon grabbing reminds me of Timeshift Maybe when you have no ammo