1. MGS4
2. Uncharted
3. Heavenly Sword
4. Resistance
5. Warhawk
Though those last two are iffy. Folklore and R&C (which I've only played an hour of :/) could take their places, depending on my mood.
LittleBigPlanet is soon to take first, and a few others will be making the list as well, probably Eternal Sonata and Valkyria Chronicles.