I just finished the last episode of Kuuga... and it was every bit as awesome as I was told. It felt very "old school" to me. The fight scenes were not as flashy as today, but they were still great. They had a lot more emotion to them and felt more real.
I also liked the characters. All of them were important and unlike in other Rider shows ( I'm looking at you Faiz) they were all likeable, even some of the villains.
Another positive aspect for me was the police work that was shown. Modern Rider shows tend to exclude the police or only use them as comic relief. Sometimes it felt more like a crime show with Ichijou and the others trying to find out how the Grongi operate etc.
In conclusion, a very good show, recommended to everyone. Its age shows a bit, and it might be a bit slow at times, but Kuuga is never the less a really cool show.