I think the problem most people have with Bussey is that he rode the hype of the ninja label even though much of what he did was not ninjutsu. Also, his wild outfits, high kicks, and trademark growling, are quite a bit different from mainline Bujinkan--though most everybody had some kinda cammo back in 1980's ninjutsu
It's also maybe helpfull to remember that Bussey was around 23/24 when he reached Yondan under Nagato. Being that young with one of the highest ranks outside of Japan(at that time) might explain a little. Plus, I think ninpo was still trying to find it's own image in the West at that time, so modification may have been an implied ok(godai method anyone?).
I remember talking with a student of Bud Malmstrom's back in 93, and I asked what people thought of Bussey(I hadn't been inculcated into Booj politics at the time), he snorted and replied "Bussey is what you might call a Christian Ninja" and then he snorted again. I was utterly amazed at how divisive people were when talking about him.
But, I was also amazed when I first saw classical ninpo and how different it felt/looked from what was on Bussey's ninja videos--in still pictures, besides some of the kicks, you really couldn't tell much difference between Hayes and Bussey.
Now personally, I don't think anyone can doubt Robert Bussey's prowess(I wouldn't wanna fight him), or the effectiveness of what and how he teaches--people try to knock him because of how Scott Morris did in the UFC II, but they have a tendency to forget guys like Steve Jennum and Jeremy Horn, too.
He spent a lot of time in the mags back in the 80's, so it might surprise some of his detractors that he got to a point in the early 90's were he wanted to move away from the ninja image--although some of his people didn't. I think that was one of the contributing factors to him dissolving RBWI, it got away from him, and he wasn't comfortable with some of the things people were doing in his name.
Honestly, I'm not comfortable with Bussey being a proponent of ninpo(although you can still see "trademark" techniques like ganseki, oni kudaki, musha dori...etc), but I've always liked what he does as an eclectic system. I really liked alot of the stuff he did in RBWI. Those videos are much better than the older 'ninja' videos, IMO. I like the fact that RBWI was a much more cohesive system of movement than, say, JKD--and It was much more based in grappling(clinch and ground) than a lot of other ecelctic groups were at the time.
All in all, irregardless of what people think of him, I think he genuinely wants to instill effective self defense methods to his people. And I think he's pretty knowledgeable about his craft, in that regard.
Anyway, I think I'm done