I would say counter-strike, any iteration of. Then ofp/arma, RO, UT99, ut2k4, Q3, WoW, W3, D2, Sup Com, COH, Sins, hl1/2, Rome/Med II TW, SC, the list goes on and on of truly amazing PC games that still have huge followings. While it's your opinion, I would say that you should only include PC...