Well, yes. While the Kzinti in the Man-Kzin Wars books (which I concede are not his writing) are always interesting, the humans almost always came across as Hollywood-style stereotypes.
Of course, having read adventure/fiction from other authors (Wilbur Smith's Cry Wolf in particular put me off, big time) I shouldn't complain too much, but one can't help but pick out stereotypes where one sees them.