I hated my Samsung "Smart TV". All the apps were slow, the Wifi receiver in it was crappy. Since I have so many devices now that have all the streaming apps (PS3, PS4, WiiU, Apple TV) I can save money when buying a TV by looking for the most dumbed down basic TV I can. I just need something with a good amount of inputs and that's it.
The last smart-type TV that I bought actually used Roku baked into it. At least Roku is a well-known and independent service and not a manufacturers proprietary shoddy system.