I don't think the documentation is really great. I think it is terrible. Every page seems to assume you understand the internals and the documentation attaches fancy names to concepts that are difficult to understand from the documentation.
For example, "workers' mercy", "zerg mode", "emperor mode", "the zeeg problem", "uwsgi mules", "harakiri mode".
I for one would like uwsgi a lot more if it focused on a few simple patterns that worked for the majority of cases and explained them thoroughly, including their tradeoffs.