I've never played a Dynasty Warriors game either, but I've seen a friend get addicted to it which made me want to check it out.

The main reason I'm interested in it is because of the lead up to the final boss in Skyward sword. Link is running to fight the final boss, but stopping him in his tracks is a horde of low level enemies and some high level ones. This created the same sort of environment as Dynasty Warriros, and was generally pretty mad. I loved it. I want to see more.