Having been a web designer for the better part of 15 years I think you should be careful when you lump designers into taking the blame for this. In doing so you give them way to much power.
Any real designer would consider the new Netflix site an abomination. It sucks for the reasons everyone knows it sucks. But if you've ever actually done design work you would know that these sorts of sites rarely are the brain child of a typical web designer. These horrible UI decisions are usually the result of many layers of bureaucracy inside a company, with middle managers inevitably deciding on their own pet ideas and influencing design ("Ohh bigger images, bigger!", "Hover scrolls! Those would be cool and fun!").
In fact, the hardest part of being a designer isn't design. That's not particularly difficult. No, it's the fact that design to most people is subjective and thus everyone feels the need to want to add their own bits and pieces into a design, even when they make no sense and are horrible ideas. This is why so much of design education is learning about critique, because inevitably, someone will want to add amazingly bad ideas to an otherwise decent UI and you need to learn how to argue for (or against) your ideas.
What this design says to me is that Netflix may have just gotten too big for its own good. Marketers and managers seem to be having way too much say on the user experience of the website. This happens to all big companies eventually, it's just unfortunate that Netflix has finally crossed that line.