Not the original, but still amazing!
Factions is a superb game despite what some skeptics might say about it. The game brings a whole new light to Guild Wars along with new challenges that await those willing to take the plunge. It introduces 2 new characters (the Ritualist and the Assasin) and also a whole lot of new skill sets for existing characters, as it is a stand-alone game as well as na epansion.
In the world of Cantha two sides are fighting against each other, but are brough together bya common enemy. You get to choose which side you fight with in the game and earn points and skills for that "faction" - I's a very interesting and new way of playing. One of the nice aspects is new "elite" missions in which you have to party up with as many as 12 other human players to make it through a grueling, tough missions with booby traps and monsters that will eat you for dinner.
The factions story isn't as compelling as that of the Prophecies campaign, but ti is a good one none the less.
If you want to start here with Guild Wars, yu won't be disappointed and i's a great game for all GW lovers already as long as they have an open mind!