I was first introducted to Android TV when I purchased an Nvidia Shield and really like Android TV. This was a few years ago. Since then I upgrade my TVs and decided to get TVs with built in Android TV. One of the big reasons I like Android TV was the TV app as it would combine OTA channels with channels from other apps (like Pluto TV). Having a TV guide for all those channels in one place is really nice. Granted it is not perfect as it would often lose the channel guide for Pluto TV, requiring me to open the Pluto TV app to refresh it. However, that in not what has turned me off of Android TV. No, that would be the combination of the software (Android TV) and the hardware. Being based on Android, it suffers the same issues that Android phones do. Google has set the hardware requirement so low for running it, that if you purchase a low end phone, the OS will struggle to run, be slow and even buggy at times. At least with phones, you can tell by the price point or even looking at the specs. This is problematic with TVs. I have a Phillips and RCA tv. Both, at times, struggle to run Android TV. When it first starts up, you need to wait at least a minute after the home screen appears while the OS finishes booting or you will find the response time slow and any app you start will likely to crash. Both TVs also, when I turn on the TV, like to tell me that they cannot connect to my wifi. This requires a reboot of the TV to fix. Too often, both TV struggle to respond to my commands and I am constantly rebooting them.
Before the haters start hating, let me say that my recommendation to others is not "don't by Android TV." Rather my advice is to avoid getting a TV with Android TV built in and to avoid cheep android boxes. Like Android phones, you get what you pay for. If you want to use Android TV, spend the money and get a quality Android TV streaming box (like Nvidia Shield). If you do not want to spend the money for a quality Android TV box, then get a Roku as they are cheep and do a good job of being a TV Streaming box (but without some cool features).
I disagree saying cheap boxes can't run it well. I have 4 of the Walmart $20 Onn 4K boxes and they run Android TV like butter. It's very smooth, even cloud gaming (Stadia and GFN), zero issues with the live channels either.