Most web sites with video for example, HULU and others fail to play from Smart TV web browsers. This area is a minefield and if you expect the same web site you watch on your PC to work on the Smart TV web browser you are going into a minefield.
I don't want to write that these Smart TVs aren't a good idea, but the execution is flawed. And those that sell it rarely tell you the truth.
I will write that you should never pay a dime more for a TV and a TV with that Smart TV. It's not worth a dime given the current state of affairs.