I get a ping of like 400 or higher on dialup and it functions fine with no lag most of the time. It's a MMORPG (massive multiplayer online role playing game) and after you purchase one of the three packages (propechies, factions or nightfall) it's free to play unlike some MMORPGs like World of Warcraft.
I switch characters a lot so I can't give any definite one at the moment.
When (if) I ever decide which one to use for a while, I'll tell you.