Guild Wars take the MMORPG to a new level, reducing much of the old problems in the genre
The gameplay is easy to understand, without a huge learning curve neccessary for the basics. To master the game takes a full run through all the missions. If you're starting out I would suggest playing as a warrior/monk you get heavy armor and you can heal yourself. The game is a masterwork, and with new content released in the Sorrow's Furnace update, you can expect the game to be playable for a very long time.
However, the game's plotline well, lets just say that I really don't think that there was much thought put into it. Its kinda dumb. I won't reveal the plotline here since it kinda does spoil part of the game.
Oh and the biggest bonus? NO MONTHLY FEE!!
Okay to summarize
Pros: Game easily playable online, no monthly fee, easy to understand
Cons: Plot is well dumb