One reason I love Kuuga is in ep 35, the ep where Kuuga battles one of the more frightening Grongi. One thing I've noticed with Sentai and Kamen Rider is that the heroes fight with a sense of civility. Despite how many people they see killed or what terrible evils they face, they don't allow it to get them. In Kuuga 35, Yuusuke is clearly enraged, releasing all his rage on the Grongi, not showing pain and just slashing. But at that time the weight of his responsibility and power truly dawn on him , making for an extremely powerful episode.
I'm not saying that all future tokusatsu heroes have to be merciless when dealing with enemies, but an occasional Wolverine-style rage would be thrilling to see.