Messiah - you are possessing the bodies of the enemies including the weapons and access rights and alignments. If you get killed you just take over another person, or you jump from person to person. Amazing and very overseen game.
Red faction - Destructible environment. Rarely seen ever again outside of the series .
Gratuitous space battles - Create, position and configure a fleet, just to watch the battle unfold and see how well your planning turns out, without interfering.
Counter operative mode! So much this!