Although I'm not the greatest ninja by any means, I really am enjoying the class and am highly considering maining it although i only started playing it less than 2 weeks ago.

I keep reading about how their DPS is much lower than the rest of the jobs but I honestly feel like the gap from highest dps to lowest can't be more than 20%. I feel like i'm still plenty strong switching from summoner to bard to ninja and my solo extreme clears are all very close no matter which job I play.

My advice is play ninja if you feel and don't be scared about having lower damage because fun is much more important than what's currently best.