It would be quite a feat for any one person to play all the excellent games on Steam. You just need to find the games that appeal to you.
If you have friends that you play with online, perhaps check out 7 Days to Die or Ark: Survival Evolved. They are insane fun with friends.
You're not alone. Those Flash sales keep sucking me in then I spot some other game Steam has lowered the % yet another notch and, well, I'm weak.
Verdun, aye? I might take a look at that one but I'm staying as far away from the Arma stuff as I can physically and mentally get.
Played Verdun for a bit and it looks and playes well and I think for 11$ it's a bargain.
About Arma I can understand you, Arma 2 after 7 years from release is still broken and keeps patching.
Arma 2&3 have the same kind of inferior engine which has many flaws but it's one of the more realistic graphics I ever seen, everything looks and feels so real.
Also Arma games are the best military simulators ever made, and as a veteran who's been in a combat or two I can say with confidence that no game comes closer as these two.
Arma 3 is now 23$ and that's a damn good deal even ask Utivich:Link.
Don't forget to grab the Fan-made patch. I can't remember if Steam applies it.