I've been playing doom 2016 using steam's wine offering, proton I think it's called. There currently aren't a lot of games the steam client beta supports, but it at least was painless to install and run. Hopefully they'll continue to support wine going forward, and start working with publishers to get more big budget games working.

Blizzard has officially stated they won't boot you (permanently, apparently there are occasional false positives) for using other wine offerings. I've been tempted to try to install Overwatch using Lutris as well (productivity be damned!).

I'm lucky in that I tend to prefer indie games, which are more likely to support steamos, but I'm certainly feeling optimistic about gaming on linux. I've found that I need to boot into my win7 partition less and less in the last year for games reasons.