Alright, I looked through that incredibly long thread about ninjas this morning and saw many complaints. Lemme try to address them all with my suggestions from hrmm, your time Crypticant. Maybe if you guys would have listened to me way back then, we wouldn't have this problem now.
Name: I personally believe the name is fine, but assassins would limit the class to being seen as only able to fight when it's that "one hit kill" fighting. Samurai would be a retarded name, seeing as ninjas were the mortal enemy of the Samurai. BUT I believe that if you're gonna keep the name as Ninja, you can't keep assassinate. So forget name changing and keep it as ninjas, rid them of assassinate.
Skills change: The way I've been looking at ninjas is kinda the same way I've looked at monks/blademasters. Screw assassinate. Gearing a class around one skill is kinda retarded. They have awesome skills for fighting, I just see them a bit low on defenses. Don't give them something ridiculous like twohanded or shield block, but I believe they should get a defense that makes the ninja anticipate an attack, avoid it, and strike a vital organ. This skill if mastered is always about a 25% probability that it would ever land. A way to make this skill more interesting would be to change study. But if you study someone, say Crypticant, and their soul bears your mark. You recognize their movements and habbits, hence making your defensive strike more of a 50% chance of happening in a round. Hence making study useful.
Another change you could look into is making them a bit more geared to trickery. Something such as an ability that draws your enemies attention, such as a lolly pop, who wouldn't want to pick one of those up? Then bam, ambush from the shadows, OUCH that hurt like a mofo. Not so much like backstab or anything like that, but maybe a traumatic strike to your kidneys. I mean really, who likes peeing blood?
This would make ninjas still geared towards being sneaky and using study, as well as being tricky and using diversions. Then choosing the right ninjitsu suited for you would make you a worthy adversary against people like those bash/bodyslam locking bastids. I dunno, maybe I went over the top with them, but that's the way I always saw ninjas.
KING DING A LING HAS SPOKEN!!!!!!