If you want extremely strong attack and extremely weak defense - go go ranger.
Anyway Lionx, you're right about that. However, when I said a "good ninja" I meant it, because I've really lately had honour to party with some awesome ninjas who hold hate better than some paladins and they deal good damage too. But yeah, it all depends so much. Guess it's just us - rangers - who loves arrowburn parties and ninja tanks generally.
As for Drk vs WAR issue - I'm under impression that war/nin can outdamage any drk *most of the time*, but I could be wrong. war/nin with dual wield axes are a LOT of fun too.