Do you always blame others for pointing out things that you failed to see?
TFA is decent enough for fans, but it's a really mediocre movie, more set up around a bunch of 'neat ideas' by which I mean producer ideas (big fucking spider), than around any story that has any sort of interest to a non-fan or someone who has seen more than ten movies in his / her life. Rey being a 'mary sue' is pointed out because she is a protagonist without any real conflict, which would be a death sentence for any other movie. Her side character, Finn, has actually more story to him than she does (a situation I have only seen occur in Twilight), and Kylo Ren is about as interesting as a wet blanket. He only derives meaning from Darth Vader, a character that has literally been dead since I was born.
And yes, I just completely ignored the prequels because I've pretty much ignored them since they were even announced. They're pointless movies and they exist as Lucas's personal bonus round. The argument that TFA needed to erase the prequels therefore holds little weight to me, since they were clearly never really related (or not in any good way at least). The Pod Racer game was neat though. Hard as balls (more like broken), but at the same time strangely appealing on that angle.
But in general this idea of defending your position by saying that every other opinion must be wrong is just really childish.
I know there's plenty of bad critics out there who add nothing to a discussion, but that doesn't mean something is suddenly great or that the boxoffice equates to quality or that the RT meter is a good indicator of actual critical opinions after the initial feelings have settled.
as for the actual video, I liked that they appreciated the meta-fact that most of these channels kind of owe their existence to bad movies like the prequels. Other than that kind of 'eh', but then this isn't a YA movie that's an easier target.