They are as much a part of Mugen as mugen itself. Everybody and his dog has a mugen video channel, or had one at some point.
Mugen videos have come a long way since then. There's still some dragons out there, but there is lots of good content to boot.
but what nobody really ever talks about is what makes a good video and what makes a bad video.
What do you think a mugen video should have to be considered good/bad or acceptable/unacceptable?
Is there a community standard on other mugen communities for videos or does nobody really talk about it?