I play WC3 mods with my friends all the time. Mine's cracked so I can't play on Battle.net, but I just Hamachi it with my friends. We usually play WinterMaul or DoTA.
I guess but comparing Runescape to Crysis is sad. I'd take a FPS with amazing graphics and gameplay over an ancient RPG with very poor graphics, repetitive gameplay with a predictable range of equipment overpopulated by 10 year olds, anyday...