The Warcraft series has a long history -- which is to say there's a lot of lore behind the game we play. But you don't necessarily have to keep up with every detail of the story line to enjoy WoW's way too addictive gameplay. For my part, I frequently don't follow the story. Lore has just never been my thing and, though I enjoy the game plenty, I don't really keep up with the intricacies of the story.
But what about you, readers? Do you keep up with the game's lore and story? Or do you care more about gameplay than storyline?