I inhaled this third in the Ringworld series in a few days and while I understand the criticism of many of the Amazon reviewers who didn’t like it (mostly because author Larry Niven drops you into it without much prep and doesn’t seem to be taking you anywhere) I enjoyed getting to know the various hominid species. Read carefully, you soon see where it’s going and why. But anyone encountering it alone without having read the previous two would be lost, so it’s a very poor starter.
But it’s a treat if you read them in order–especially one after another the way I have without intervening years to cloud the memory. It’s also a cliffhanger, which I’ve read is resolved, and then some, in Ringworld’s Children, which appears to be the final book. I hope not. Niven hasn’t explored more than a tenth of the available terrain. But maybe he’s tired of it. Maybe I will be, too, after number four. But I doubt it. I’ve put a library hold on it, and hope to have it by Tuesday or so.
THE TEXAS SCRIBBLER 
The problem is that it’s so huge, a tenth of the terrain is like, a brazillian times the size of the Earth.
I just reread the last two, I’ve read the first ones so much I can’t read them anymore.
The last two are actually better the second time around, surprisingly enough.
I’ve just begun the last one now. I am dismayed to see that it’s so short. Niven does, indeed, seem to be getting tired of his baby.
The last one is very dense though, much more so than the previous ones.
There’s something going on all the time and you have to pay attention.
I just finished it this afternoon. It was great. I checked it out of the library, but it was so good, I may buy it.