I played Requiem, is a very good game visually. is very entertaining, has an amazing atmosphere, gore, and many missions and huge maps, but has no pk system like KO. KO is the best of all in PK. Diablo3, shall auction system (but the blizzard gets 15%) that, apart from the tax paypal. also begin as PVE. I doubt it so interesting to spend too many hours, killing alone or in small groups (maximum party are 4) monsters and more monsters, it seems very laborious. What has KnightOnline, unlike other games, is the best pvp of all MMORPGs.