Ninja really isn't all that complicted, the hardest thing is remembering some of the mudra combos, which that in itself is pretty easy. you'll have to watch your dots, but that's every dps class, and nin only has 2. If there's no war, you'd have to keep up your slashing debuff as well. Aside from those, only thing you have to watch then is huton and you trick/sneak attack cool downs. It seems complicated, but just level it to 50 and play around with the stuff. It'll make sense.