My Top 10 List will be like this :
1) Need For Speed - Any part, be it Carbon/Run/Most Wanted/Latest One
2) Hitman - Because of the Skills
3) GTA
4) Soldier Of Fortune
5) Prince of Persia
6) Tekken 3
7) FIFA
8) Ben 10 Games ( Flash One Because I play them all the time in my office: hiding from my Manager)
9) Mario
10) Contra