One of the two films I haven't reviewed yet for this site. I watched it a while ago, and didn't really like it. Felt a bit like a patchwork movie, with some scenes featering Winnetou taken from a completely different movie.
Those late Karl May movies often fall between two stools: they are too childish to compete with the spaghetti westerns, but at the same time they lack the naive poetry of the first movies. The problem of the May stories is that they belong to a different world, a pre-modern, christian era, when indians were still thought of as noble savages. If you want to sell such a story, or message, you got to play it straight, you can't mix it with spaghetti western ingredients, that simply won't work