Fun game.
Level 15 and still really enjoying the PVE. Really nice system of missions/quests that take you through a story, complete with cinematics. If you don't have friends the game even gives you NPCs/Henchmen/barnies to give you a hand. Have not tried PVP yet.
The instanced worlds/missions rock. Basically take everything bad out of a MMORPG (KSers, leveling grind, Kampers, griefers etc) add a dose of decent RPG style quests and you have guildwars......
Only problem is you can only go to level 20? In a few weeks I'll make that, then we'll see if I get bored or other classes/PVP keep me interested......