This conversation always makes me wonder how different it would be it steam machines had some big marketing push and message behind them. They don't, and that's alright because the project itself is not so compatible with a marketing blitz.
The Controller
The Machines
The OS
You don't have to use any of them. When people buy anything on steam, money goes towards these projects whether they like it or not.
The controller is brilliant. I've had one for the last week. The Alienware 450usd steam machine is a fair price and has good performance and is attractively styled. These are my opinions and I'm just putting them out there. What I really want to comment on is the os.
Steam OS. I've used it daily for the last five months or so. I'm one of relatively few people doing so. As far as I know, everyone using Steam OS right now is doing it because they are particularly interested in the project and want to participate in this phase. There's not a whole lot more reason to use it at the moment. That said, it's been really pleasant overall.
I dont actually own windows so I am "missing out" on the windows games. That seems to be the main complaint about steam os: That it doesn't play every game that windows does. I think this complaint is weird because no platform other than windows plays everything windows does. Besides, I have a playstation 4 so most aaa games are available to me. If I didn't have that around or couldn't afford it I would dual boot windows on my steam machine so I could play sf5, mgs5, witcher 3 (But not bloodbourne or gran turismo 7). So I have 2 next gen consoles: A ps4 and a steam machine. The ps4 affords me access to the most conspicuous games missing from steamos, and a few missing from windows as well. The steam machine gets a whole lot more playtime, tho. It has a much different selection of games and I end up turning it on more often.
I have 43 games on my steambox. They were all cheap as chips, they are downloadable and playable on any lin mac or win pc with just my authentication, and they represent a great variety ranging from shooters to strategy to adventure. The library and store are very distinct from a ps4 and I enjoy them immensely. So I hope one can understand how the innability to play every windows game is not souring me on either my ps4 or steambox.
Installation and maintenance is a treat. You can download it free, and bring up a system from a usb stick. Otherwise, I'd have to go buy a liscense to windows 7. It's nice to have something free that you can just download and redistribute anytime. Once it's up, you set the overscan (put the arrows to the edges of the screen) and it's good to go. It automatically forces everything to fullscreen, forces triple buffer, and forces the global overscan setting on all graphics. So while you can make a windows machine do these things, it's good to have an out of the box system that already does these things. After that, the ability to forget about the desktop for as long as you choose is really great. With windows, no matter how much you set it up to act like a console, you are going to end up back on the desktop for something, no matter how small. You may think this is a trivial point, but I disagree.
One enormous bonus is that its open source and can be modified completely. Theres not alot of that going on atm, but the potential is huge. A small example: I install steamos with vaporos; an installer package that adds the basic software that is missing on the standard steamos desktop. Notepad, vlc, that sort of thing. This is a little modification but what's important is that it's okay to repackage valve's os and redistribute it as one sees fit. This represents a potential that doesn't exist on windows. I can't take windows, modify any part of it I think needs improvement, re-name it and freely distribute that. This is important.
Consider that before steamos/ubuntu steam, any "gaming" pc used to be a brick without a legal or illegal windows liscense . Now that brick can be ready to rock in minutes for free with zero configuration or legal implications. Or antivirus. Or viruses. Future maintenance is all handled thru steam updates, as well. I hope I'm not the only one who can appreciate this progress in computer gaming.
Steam OS is good. You don't have to use it. Just buy your steam machine and put your windows on it. Or just keep playing on your built pc with you keyboard and mouse at your desk like you always have. You'll continue to support steam os and steam machines by using steam and buying steam games and on behalf of steam machine/os/linux desktop users everywhere, I thank you.