I have to agree with many of the posters on Warhammer. The setting is very original, very grim, and extremely brutal. In the Warhammer world, you do not go for a dungeoncrawl, you just try to keep living until the next day. The Incursion of Chaos has shattered an already bleak world, and the forces of Chaos warp and twist everything in sight, creating new races (among them beastmen and skaven) while altering others (trolls, dwarfs and humans, among others). Foul gods, surface dwelling dark elves, malign lizardfolk, green races and humanity all create very formidable obstacles for your average garden variety adventurer. A great lark, and with books like the original Realms of Chaos tomes (you think the BoVD is vile? HA!) to add flavor to a world on the edge of madness. Not to mention the fact that the miniatures are already made, and the Black Library turns out some excellent novels to support the gameworld.
Father Nurgle watches you,
hellbender