the bad guys you can play with are rather limited,
Orcs,
Uruk Hai,
Wargs,
And Spiders
But the system is quite interesting, the "pvp-arena" is also the area where the highest lvl'ed characters have quests; "Angmar", so you are a monster (mob) and you're only goal is to eat hobbits <img src="/ubbthreads/images/graemlins/tongue.gif" alt="" /> no, it's beeing a pain in the arses of players that roam Angmar.