I use it around 50% of the time, with few issues. The integration with Hulu and Amazon work really well. Content from broadcast & sports networks also work most of the time. Minor issues are usually resolved by force closing the content app (ABC, NBC and especially HGTV etc). As has been mentioned, the lack of full Netflix integration is a pain.
I also use Playstation Vue to watch content. I suspect full integration with OTT streaming services (PS Vue, DirectTV Now, YouTube TV etc) will not be coming anytime soon or probably ever. I am ok with that. For what I need, the TV app works fine.