I think he means sprinting like they had in UO. I played the MP in COD2 but I find COD UO is much better then 2, it had better maps, better weapon balance, vehicles, sprinting and cooking grenades. I hate the grenade system in 2, its cheap now that you have a hotkey to throw nades instead of pulling them out and throwing them; if I wanted to play Halo I will play Halo; grenade detector is stupid as well (I guess they had to do that because there are grenades everywhere now).
Sniping is also ridiculous, you stay in scope each time to reload the bolt and you can hold your breath, don't even need to prone for sniping anymore. Health system is retarded.