Even if I hadn't played WOW before trying Guild Wars I would have been less than impressed by this Game.
One of the things I enjoy most about a good RPG is being able to freely explore the world. One thing I really despise is invisible barriers. Unfortunately Guild wars has many invisible barriers and numerous frustrating quirks such as not being able to move through bushes etc. You get hung up on corners, cant move down simple slopes but have to go around. You can run across shallow water but you can't swim. All minor anoyances but they add up to one annoying package.
The game would have been barely impressive 2 or 3 years ago but by todays standards its pathetic.
The game does look nice even if it's not nearly up to WOW standards which is today's benchmark.
I suppose the great appeal of the game is PVP combat between guilds, getting ranked and all that, which I'm sure is cool but the presentation of the game is just plain bad.
My opinion probably wont improve much since the thing I like best of all is freedom to explore.
Still since there is no monthly fee its not a bad deal just don't expect an experience anywhere near the level of WOW.