Diablo? No. World of Warcraft? No. MMORPG? Not really. Action Hack-and-Slash with limited RPG Elements? Basically.
There is alot of character depth as well, Because the game has many jobs, and each job can take on the traits of another, So combining 2 jobs in one.
HOWEVER...
The max level limit of this game is 20. Whats also frustrating is that you level up very slow. I don't understand how this game seems like Diablo, Normally Diablo games have incredible weapons and Armor, but Guild Wars only seems to have lame Unidentified weapons, and most of the Rarer ones are just basic duplicates of another.
The PvP is another story. Here, there is no MMORPG. Or RPG entirely. If your expecting 20,000hp hulking 1900 damage a hit warriors, you will find 400hp, and lots of 20s and 30s. That keeps it simple. However to build a good character, You have to play through the standard Role Playing to unlock any of the good skills. Basically, the Normal Role-Playing mode seems like an Offline RPG. Not MMO. The PvP Is like an Action Hack and Slash. The game has solid controls but lacks in depth, for it's only depth is the skills. Each, "Stat" or Trait of your character has a max of 13, and none of these are your standard, Strength, Agility, or Magic. These are Character traits, and some increase the power of one spells, while another increases another.
Visually, the game is great. Each area seems unique and graphically detailed. Nothing much to complain about there. The music, however, is basically the same,Ye' Ol' music. Those you hear in movies, the old, strung guitar and piano songs. You won't focus much, and what makes it worse, it's usually the same song over and over.
One of the better things I found interesting, was that the game has a very good storyline. You can find yourself in a green, Peaceful setting. Then find yourself in the same town only its utterly destroyed, No vegetation, and all the water has been turned to tar. The transitions between these events are very well done, and each period of the story has it's own town, and you only see people that are that far in the quest. As I have said before, You only see other players in town unless your in a party.
You won't find yourself sucked into it at first, and this game may not keep you going forever. If you have the energy to unlock the best skills in the Standard Role-playing mode, The PvP can be a fun Hack-and-Slash experiance, because there is no RPG elements, and the Role-playing will feel like one of the Slowest, Shallowest RPGs you have ever played.