Crazy character customization, amazing graphics, unique experience, and it's free, so no harm in trying it out.
Contrary to a lot of other Free to Play games, Perfect World International has a ton of content.
The PvP is fun and dynamic, and really encourages small groups of friends to stay together. Group PvP is definitely fun as hell.
This game is definitely worth trying out, especially since it's free.
Lastly, the company who is hosting the game seems pretty good. Their website looks very professional compared to other Free to Play game sites, and so far every time I've emailed their customer service, I've gotten a response within an hour every time.
Two thumbs up.