I have a smart TV that has some kind of integration with Roku, and never had any issues with ads, bad UI, etc. It also has a tangibly better UI than other TVs I

I have a smart TV that has some kind of integration with Roku, and never had any issues with ads, bad UI, etc. It also has a tangibly better UI than other TVs I've used, with features such as showing on the start-up screen what's being fed into all the HDMI inputs so you don't have to guess which one is connected to the cable box and which one is connected to the Wii. You can easily ignore all the other stuff it does and just use it as a dumb TV without much trouble. Not affiliated in any way, just something to look into if you're trying to avoid adware and the like.