No idea what's wrong with your's but mine (5 of them now) all work flawlessly and stream Netflix without any issues. The UI is smooth and easy to use, not sure why yours aren't working right. At least two of mine get daily use.At this point, Apple should just take Apple TV out back and shoot it.
I own 3 of them and they are really getting long in the tooth. The UI is terrible and slow. Netflix barely works on it anymore.
While you may not like them doesn't mean that they are bad.
As for content that is the providers issue, too many are stuck with being afraid of embracing technology and giving the people what they want. The ability to buy / watch any show at any time without having to subscribe to a gluttony of other crap.