Marionette is a solid framework. It has everything you need to build fast, and clean: regions (which were a great step in the right direction and will be improved in V2), composite/collection views, layouts... the basics are there for you to work with how you would like.

You've made three points which I can't see much fault with. Why the hate?

I'm sorry that you don't see much fault with it. I've tried my best to explain.

I'm sorry but [0] and [1] are complete non-issues and I'm not sure I fully understand your point with [3].

The code is very far from terrible. Go look at Marionette's source on github - you'll find it's extremely easy to understand and reason about. Now try and do the same with Angular or Ember...

How are [0] and [1] non-issues? I like my libraries "SOLID" and "Clean" (look em up). I have worked with Marionette's source, and it's neither.

Point [2] means, to use a different renderer you need to replace Marionette's internal renderer completely like it's a global (globals are bad).

Angular's source is pretty clean, minus compile.js and select.js

try the stickit framework by nytimes, works great for me