To be fair, the line was dying in 1992 with or without Ninja Force. Remember Mega Marines, Eco Warriors, StreetFighter II, Star Brigade, etc, etc. They were swinging a lot, and missing even more.
I like Ninja Force, but realize they are not for everyone. Slice & Dice are pretty good and Banzai is one of my favorites b/c he is just such an "out there" character. I even have a custom of have that is spot on.
You could work Budo in a NF set.......apparently, Hasbro was looking to release him as part of the 30th.