Xfire says that i've played WarRock for 743 hours . In reality it's probably more like 900+ hours since i didn't always have xfire online when i played it, plus it also didn't count any of the time i spent on korean warrock (which would have probably been at least another 40 or so hours)
After WarRock, my next 9 most played games are:
2. Runescape. I don't have any way of telling how long i actually played it for, but i started in 2005 and played it on and off until 2010. Didn't really grind on it but i made about 5 different accounts, my main i got to level 70+ with fairly decent stats in everything else, a second character to level 40-50, and a few other accounts around level <20.
I'd say i probably spent about 500 hours on it.
3. Garry's Mod (307 hours)
4. Sims 2 - 160 hours according to xfire, but i know this time should be around 200 hours.
5. Gunz - 158 hours, again probably more like 190 or so hours.
6. Dungeon Defenders (185 hours)
7. WoW (150 hours)
8. America's Army (135)
9. Fallout 3 (119)