Less well known enjoyeable games I've played:
Binary Domain (think Gears of war with robots)
Bulletstorm (alternative on the normal first person shooter)
Enslaved: Odyssey to the west (A bit like the modern prince of persia games - action adventure).
Vanquish (3rd person shooter with robots published by Sega)
Mirrors Edge (a marmite game free running mostly 1st person non shooter)