Where the big difference lies is in the environment of the quests. In Guild Wars, when you leave a city, you zone into your very own copy of the outside world. This instanced play was created to alleviate problems of corpse looting and camping, boss queues and other respawn problems that happen in WoW. The trade-off is that once you enter this instance, your friends can't join you and you don't really experience that truly massively multiplayer feel. This is the one reason that Guild Wars is often denied the title of an MMORPG.
Continue on with Movement and Combat>>