There are actually many open-source projects that have excellent documentation and there are many that don't have documentation at all. I think there's actuall

There are actually many open-source projects that have excellent documentation and there are many that don't have documentation at all. I think there's actually a shortage of projects with simply adequate documentation. Many open-source projects also allow you to contribute to the documentation, so I don't think you should criticize projects you're actually using but rather that you should help maintain the documentation (even if it's just bug reports). If you have an open-source project with very few users, you'll often find that you can't get traction simply because when people can't figure out how to use your software, they'll go elsewhere. Want fame and (maybe) fortune? Make your project useable.