If I may add another thing to place here.
I'd suggest "Don't mute out/replace your game audio if you don't have to" for people who tend to fiddle with the audio.
This is mostly because I recall before the "Let's Play" era, a lot of videogame videos on Youtube would be a video of a supposed "stunt" or even just regular gameplay, but the audio would be some grunge rock or rap instead of the in-game audio. This was common enough that I tended to prefer looking for videogame gameplay videos elsewhere. I find this really off-putting, because
1) Many times these are removing examples of great video game music in favor of what is either "hip" or "mainstream" to the uploader, and these tastes may cause unnecessary clashing with people who may otherwise enjoy your video.
2) The actual musical choices may jar with the tone of the game (Especially apparent with early JRPGs or platformers)
3) The muting of in-game music and SFX breaks immersion into the video.
4) The popular choices for music replacing tend to be copyrighted anyway.
Of course, I'm not sure how relevant this all is now - in an era where XBLA games have custom soundtrack options this is a tad less an issue because you can at least play music without muting SFX, But I hope this is useful anyhow.