I haven't done the Warrior Dash, but I did do a Spartan Sprint in November. It's a similar type of obstacle course. Do you enjoy obstacle course type races where you get muddy ? If so, you might enjoy trying one. I had fun climbing over walls, shimmying through tubes, climbing up rope ladders, carrying heavy weights, etc. It was a challenge that I was thrilled to complete.
Now, the entrance fees plus insurance can be expensive and the Warrior Dash, Tough Mudder, Spartan Sprints won't let you compete unless you have insurance. So keep in mind the cost of the race could run you $100-$150.
Also, how's your strength ? If you're going to do an obstacle course, you're going to need to start practicing your pull ups and push ups. You're going to need good strength as well as cardiovascular stamina.
Still, if you're looking for a challenge and want to have fun, sign up.