Are we talkin about attacks and styles or actual fight choreography?
Cuz as far as choreography goes, I agree with Bolt. Its been getting better as of late in KR. Putting Koichi Sakamoto's random episodes/movies aside, since his work usually stands out far ahead of the rest, a good example of improved technique is OOO's Tajadoru form. Seiji Takaiwa (im sure i spelled that wrong) does a lot more intricate choreography in this form than he does in any of his other OOO forms. His hand-to-hand combat against Uva a few eps back really caught my eye. Decade and W had some good choreography that reflected their respective styles.
I havent seen all of Kuuga yet, but I can see why it is highly regarded in the action front. Seemed like it had great set pieces and events. But as far as choreography goes, they went for the more rough approach. Maybe its because fancy choreography hadnt quite hit its peak in popularity at that point. But its still fun to watch.