Halo Reach, Halo 3, Halo Wars, GeoW3, GeoW2, and Halo : ODST dominating the top ten list.
That's 6/10 HaloGeoW 360 combo people are always speaking about as cliche on the 'net. You got your monies worth! :P
So I've been a member of the raptr website for three years now, a magical place that tracks your game time on 360 and PC and so I figured I celebrate my usual way by listing my ten most played games tracked by the site but with less effort involve. I'm lazy.
10. Borderlands - 80 hours
9. Modern Warfare 2 - 91 hours
8. Minecraft - 98 hours
7. Halo 3: ODST - 110 hours
6. Gears of Wars 2 - 112 hours
5. Gears of War 3 - 129 hours
4. Halo Wars - 139 hours
3. Mass Effect 2 - 167 hours
2. Halo 3 - 202 hours
1. Halo: Reach - 658 hours
Note - Almost none of my game time from the first quarter of the year was tracked because I had no access to the internet. But the only game from that time that had any chace of being on the list is Mass Effect 3, which I doubt I've spent more than seventy hours on.
Also, Metal Gear Solid: Peace Walker HD is tracked seperately from the rest of Metal Gear Solid HD Collection. If you combine my playtime of the whole collection then I've played 98 hours of Metal Gear Solid HD Collection, tying it with Minecraft as 8th most played game.