Company of Heroes 2 is out on steam now, $10.00 instead of $39.99. Great deal.

I just brought it. Waiting for the game to finish downloading.

Do you have to run Steam inside wine to download windows games from the Steam store?
Has anyone tried running wine on Steamos?

Yes. However it is a crap shoot to find which games will run under Wine and can be a PITA to get those that can running.

Anyone keep a list of games? I haven't used wine in a long time. Does it need a copy of windows to run?

To answer question of OP. I have tried Steamos. The big problem is that a lot of the game devs are waiting for Steamos to be officially released before they fix their games. Some games work now but many do not.

But I don't use windows at all so I guess I am a linux only gamer.

But not doing too much gaming really. Valve are betting on steamos in the long run. There's a lot of good stuff coming to gaming on linux. Including Vulkan. Steamos will be good for linux gaming because from a developer's point of view it is easier to support one linux flavor rather than many flavors.

Look at Godot http://www.godotengine.org (I think they are working on the website right now)
It is more than an engine and actively developed and there's no licensing fees or any revenue sharing.

Yes, the Wine website has a database about how good Windows software works with WineNo.

I don't game often, but when I do, I game in linux.

Although not being much of a gamer, I tend to take a stance that if it doesn't exist for linux natively. Then it doesn't exist at all. About the only games I've ever spent money on was Quake II and Runescape. With various other games freely available on linux that I sometimes play. Lincity, Torcs, Armagetronad, etracer (tux racer), Bzflag, moon-buggy and many others.