Yeh I had same dilemma. i uploaded a video last week and can say I'm guilty of not watching it a few times first before uploading. The lighting is really bad and I'm getting flicker affect. Theres a temptation to upload asap when you have spended an eternity editing a video. Lesson learnt.. watch first. Normally I would take the video down if I don't think its good enough.. I've kept this one up though because i reviewed a product i was sent for free in return for the upload. I would say definitely take it down if it bugs you. You can replace lost views but you can't replace people's first impressions of your content. Having personally made some videos I'm embarrassed of the content quality I tried harder in my last upload to level-up my content and ask my self would i actually watch it. Your problem could be worse though.. Its bad sound that will get someone to not watch. Bad video is tolerable.