Played KnightOnline for abour 2 years, there is nothing good about game right now but it was good back then. PvP combat was absolutely great in this game. It's kinda dead now because you have that über-booster packs with cheap prices, then 12yr old kids can go to higher levels and screw the community and game ethics up.

When i was playing there are paid packs, but they were not making the game too unfair. Game had 2 races. There was a good community playing the game, weekly Race Wars, castle siege wars and a warzone where pvp is always open.
Plus the game is aged now...

I am sort of into Aion now, but dont want to play it too much and get addicted.