Thats kind of funny, because it has dungeons as well as instances, and more skills then WoW.
But that doesn't stop it from getting boring fast for most people. I got about 1000 hours out of all 4 of them though so its a good deal if you are into that stuff.
Either way, the skill system for Guild Wars is more strategic than WoW's. In WoW, you can use any skill you have obtained, but really you should only use the ones that give the top DPS. In GW, you can only use up to 8 skills, which you set up in towns and outposts, and use the skills in which can give you an advantage over the enemy.
Plus, the PvP in Guild Wars is much better. Rather than splitting the community between two sides and having random duels in the street, you go to one of the types of PvP arenas and play several types of modes. To win in PvP, you don't need to go hunting for super duper gear, you use preset PvP armor, or that slightly better or worse stuff you can find in PvE. You don't need to spend a whole bunch of skill points to get the 'perfect cookie cutter build', instead, you tune up different types of attributes which increase the effectivness of skills of that type, or other things such as melee damage, mp recovery, pet damage, etc.
Although the PvP in Guild Wars is much better than most games, if you have freshly installed the game, with all those updates, your team will be dead by the time you load for the first 20 games, then they'll be out and fighting in the next 20. Hopefully you're done downloading all the map updates by then.
Guild Wars really needs a better way to update rather than just downloading map files when you go there.
Edit: And there are many ways you can put points into attributes, and get different advantages from them. Once, on an elementalist, I beat a Warrior head to head by using earth magic.
