A game for gamers.
Graphically, GW is on par with and even beyond other games. My system isn't high end, but I can still run the game on fair settings and get great results. Landscapes are wide and detailed, and populated by myriads of baddies. It's a blast just to group and go out to try the new skill you just got from that last quest.
Getting together with other players encompasses the most enjoyable part of GW, since you can work together with your friends to fight and defeat monsters, or other players if you decide to try out the PvP modes or to participate in other teams components. If getting together with others isn't your thing, no need to worry. The game provides you with computer characters to help you with quests, and even provides Heroes, a sort of computer controlled "you" that levels up and can gain new skills, and equipment that you all choose.
All in all, I've got 3 great reasons to buy this game. (1) It's free to play online. (2) It's fun, addictive, and a blast to play for hours or minutes. (3) It's a MMO experience unlike any other out there, and never loses its "killing edge". Go on and give this game a try.