the level cap is 50 right now, and with absolutely constant grinding, you can reach the cap in a few days. PvE is a little bit limited at the moment as 50 cap has made most of the current dungeons not too difficult, but we have Hell modes for the current nest, and a new raid coming soonish.
PvP is very fun, really well balanced, with a fairly large pvp community.
4 servers, but they are merged, so only 1 real server.
5 basic classes with 4 subclasses each.
really fun game