I'll be contrary to DownUpDave...as a person who presents sessions to other teachers, something that you need to get used to is people leaving your session. There are a million reasons people leave--and if that throws you off, you can be in trouble. The same goes for teaching in general--it is more a captive audience there--but you can't possibly meet every learner's needs and expectations. Contrary to educational gurus who believe that you should be every thing for every person (ideally at a salary far below what people make in other fields with similar educational backgrounds). In truth, you can only do what you can do--and if you do your best, it has to be enough.
When you make a review, your purpose is to share information with others, but really, you are doing it for you. You are sharing the information, and you are stretching yourself in a new direction. So: have fun, give it a shot, and turn off comments and ratings on the video. There are LOTS of mean, vindictive people out there who enjoy making others feel bad behind the curtain of technology (if they could live in secret in the real world, they would do the same things). Then you force people to be like DownUpDave, who, if not quickly captured by your video, they will simply move on. Moving on isn't bad. Someone telling you that you are an idiot and have no reason to live (this is tame) can be life-changing.
I love the review guidelines...but keep in mind those are to "officially" post a review here on UU, not for a post you would write on your own blog or a video that you host on YouTube.
P.S. Not saying DownUpDave is mean and vindictive on the internet...simply address the fact that people that walk away is something to expect and something to be aware of. You cannot possibly make everyone happy. That's an impossible task.