I really like your list AlphaMan and would rank those games highly, except for Skyrim... but I haven't played that.
Tomb Raider is good, but maybe a little too derivative and late in the cycle to be a true defining game. I would probably throw in Gears of War. Maybe Guitar Hero 2 or Rock Band.
Even though I haven't played it either, seems like Minecraft could qualify. Maybe some others from the downloadable category. Geometry Wars and Plants vs Zombies.
I'll throw in the original Dead Rising as well.