[Li-Ion]

I second Dark Souls, Demon's Souls and Mount & Blade: Warband.

Apart from that:
Vanquish
X-Com: Enemy Unknown (from 1994, don't know how the new one will be but I'll let you know once I play through)
Spec Ops: the Line
S.T.A.L.K.E.R. (with mods)
Deus Ex: Human Revolution
Frozen Synapse
Valkyria Chronicles