Don't buy unless you are a fan of MMORPG's
However, Blizzard has done the best of anybody at creating a game of this genre. A significant reason is that it captures the world and places seen in the Warcraft series perfectly. If you played the Warcraft games and remember the story, then you can notice things from the strategy series. Another reason the game is great is mainly because so many people play it and it is very easy to find a group for certain quests. Also, there are numerous items in the auction houses due to the amount of people that play. The graphics are great for a simple reason. A high-end computer can make this game look great, and they still made it to where low-end computers can also play this on their system. The music and the environment noises are fantastic. The music puts you in the mood for adventuring.
It seems pretty obvious that Guild Wars and World of Warcraft are now the top two online roleplaying games at the moment. Mainly because Guild Wars did something new and different, while World of Warcraft made a past system of gameplay better than ever before.
The only problem I have with mmorpg's is that a lot of their customers have played older games of the same genre. Anyway, I have recently noticed that they got used to crappy games over time. Then, as they stook only with these types of games, the value and core gameplay slowly gets better. So, I have realized that (and this is my right to an opinion) mmorpg's don't become great, they just look that way because they are compared to awful games from the past. Therefore, you don't have to make a great mmorpg you just have to make it better.