Playing WAR requires a bit of planning to make sure you can inner beast at the right times.
Otherwise it's still a pretty simple class. You go between 3 combos basically alternating. You can have a lot of fun since you get some big numbers hits and lots of focus on maximizing that.

DRK isn't terribly complex either. Mitigation is mostly hitting the button, like Paladin. There's just a caveat in that you sto use Dark Arts to buff certain skills. That means you need to make sure you keep your mana up.