The continued development and expansion of the Warhammer world and play styles of every race being fairly diverse make the game almost infinitely re-playable. The DLCs are a little too frequent and more of that content should be included in the base game, but you don't have to buy the races you don't want to play as and they are still available to murder in the game.
I personally have a deep hatred of all things elven and quickly set out to purge the world of their pointy eared sense of superiority. Let us feed their precious trees with the sickly sweet taste of their blood and may Nurgle feast on their bodies. Praise Grandfather Nurgle!