I use the Xbox One Internet Explorer and it works fantastically (though I only watch archived video, not streams.) Just hit play on the video, hit full screen, and go. It's pretty much the only way I watch Giant Bomb these days.
I'll add to the chorus. Just attempted to add a game to one of my lists, and ever after I see the green bar saying "List Updated," the new game is nowhere to be found. (Oddly, the new number ranking for the games that were previously on the list are saved, as if the new game was added correctly.)