Bujinkan Taijutsu is the ninjitsu school headed by the quite famous Masaaki Hatsume - probably the most common school and it carries a good reputation.
Terry Dobson spent some time with him iirc.
It is very propular here in Scotland, in fact at a party last week I spent some time with 2 practitioners from Edinburgh. The techniques they use remind me of Macchiavelli, Musashi Miyamoto and so on. Anything to win or damage and no thought given to the other person.
As they tried to do ever more brutal strikes/locks on me, for the first time I realised that we are what we do, and I realised how much Aikido has changed me and how I see things.
Don't misunderstand, I am not criticising the art. It is certainly effective and does the job it is meant to do.
I guess you take out what you put in