Yes, I’m a fan, although I acknowledge Niven’s style has issues, especially in the last 15 years or so. I’m still a fan. Also, a lot of people have problems with the Ringworld series, but I still like it.
Anyway, I just finished Ringworld’s Children, the fourth (and to all appearances the last) of the series, and I think it’s the best since the the first one. It plausibly clears up a lot of things that confused me in The Ringworld Throne, and isn’t weakened by the more usual hermetic Niven style we’ve seen develop over his last several novels. It does have some weak characterizations, but no worse than the others, and has a fast-moving, engaging plot.