The Roku OOBE is: Set up networking, to go to the web site, type in a code to ID your device, register an account if you don't have one, enter a credit card (mandatory), then hit the channel selection directory to find content, with stuff like Netflix and Youtube front and center. You have to pick the channels to put on your home screen. The only real annoyance I have is the requirement that you have some other way of accessing the internet during the setup; there are A LOT of people who just can't understand what is being asked when they're told to go to a specific URL. That's probably not a problem for timwhit's dad but what is a 10-second inconvenience for us is a half hour on a support call for others.
A FireTV, if you bought it from Amazon: Set up networking. Type in your Amazon password (it's preconfigured for the purchaser's account). Some stuff will be on the channel screen by default. You can pick more channels if need be.
I don't have a huge investment in what gets picked, but UI speed and better keyboard input and the voice search work in favor of the FireTV. The Roku is going to give more content options and has the headphones-in-the-remote trick, which might be of interest to some people.
The bad Netflix experiences I'm talking about are mostly found on Smart TVs, BD players and game consoles. The Wii has the bar-none worst Netflix interface I've seen, but a shocking number of people use the Wii as a Netflix interface. Last time I taught a media players class, that's how half the people in the room were using Netflix. The experience is at least "OK" on all the major STBs, though it's still richest on a PC, by which I mean it shows the most categories, titles in categories and it has sensible search options.
Oddly enough, it's also been pointed out to me that in some cases PCs don't get the best video and sound options from Netflix. One of my students noticed that while streaming a particular movie, he was only getting stereo audio watching the same movie in Windows where he got 5.1 AC3 out of an Xbox One, even though they were both connected via HDMI to the same receiver and his PC was clearly in a 5.1 speaker configuration.
Oh. Also: People who have a Plexpass can now use Plex on Xbox 360 and XboxOne.
Also, the second: Plexpass prices doubled effective last week. The lifetime membership is now $150.
Also also also: If you have a Chromecast, navigate to the "Offers" section. You can claim two free months of Hulu Plus. Ordinarily I'd yawn and move on, but just like Netflix and Amazon, Hulu Plus is starting to offer pretty decent original content.