Oh god, Backbone. I absolutely hated that framework. It didn't even seem to do anything, it seemed like I had to implement all of the logic myself. Except I had to do it their way, for some reason, and practically nothing made sense. (I haven't touched it in years, though, so my memory is probably distorting my experience)

I like the idea of React, just not what it has turned into. The amount of tooling that it has created to do things that should be simple (but aren't because of the runtime and/or the programmer), and the gymnastics it goes through so that people can have their precious (often unnecessary) SPAs, is ridiculous. That, and JSX continues to be an abomination that shits all over separation of concerns so that smoothbrains don't hurt themselves trying to reason over it.