Bad games and hype were here long before Youtube. If anything, I would say that the internet itself...or more specifically, the ability to slice up content and feed it piece meal to the masses for ludicrous profit, has been the downfall of gaming lately.
For me, the turning point was when Call of Duty Modern Warfare 2 came out on the PC for $60. At the time, AAA games were $50, there was little to no "DLC", and expansions meant $20-40 of real content. I boycotted Call of Duty and I'm proud to say that MW1 was the last Call of Duty game I ever purchased.
I blame gamers for the state of gaming. While I would never judge gamers on the type of games they play, I absolutely judge them for pushing the industry in the wrong direction by supporting franchises that are designed from the ground up to nickel and dime gamers. When a developer offers a game for $60 and then tells you up front that it's not really the full game unless you also by a "Season Pass" that costs almost as much as the base game, I cry foul. If anyone here purchased a season pass, regardless of whether your just OCD or you think its a good deal, you are part of the problem. Hell, why offer gamers 60 hours of gameplay for $60 when they could give you three 20 hour segments for $180? Better yet, lets just make it episodic and sell it by the chapter.
No, I think Youtube is one of the best tools gamers have right now because it gives us a place to talk about content in the light of the day. Sure, there is hype and advertisement but for every hype driven Destiny video there is also a video critical of it and offers us gameplay video as proof. It's a good with the bad situation.