My comfort game would be Rust. It's an easy game and relaxes me after playing CSGO for hours. Sometimes I play Minecraft,Gmod and Assassin's Creed. Those games relaxes me after a hard game on CSGO.
If this was a few years back I would of said WoW. Now I honestly prefer Minecraft with mods. I used to spend a lot of time on Tekkit, however now I'm using the Yogscast Complete Pack.
My brother plays The Legend of Dragoon on his ps2, I tend to just play whatever. I play wow so IDK if that counts as comfort half the time lol.
Dungeons and Dragons Online, Battlefield franchise, GW2... But ye, with DDO I can have all that fun that you have in normal D&D.
For me it's League of Legends, but only if I have a couple of friends to play with. It wasn't always like this but after 3000+ games it happens. But singleplayer would be The Binding Of Isaac: Rebirth.
World of Warcraft, its one of those games that (if it still exists) i see myself playing for the rest of my life. Occasionally i will get bored, cancel my sub for a month or two then come back. Years have already been poured in (831 days to be exact), i dont see myself getting rid of it any time soon
I'm gonna have to say Spiral Knights if anyone knows what game that is because it's calming and not to loud.
Any of the Total War series (the older the less micromanaging you need to worry about) or Mount and Blade Warband. Both should come with a warning that your 30 minute gaming break session can easily turn into a "it is 6 AM and I am still gaming, work today is going to be rough" experience.
For me it would have to be Smite. Even though it is competitive and can be hard playing with people that live off BM, playing with a team that actually works makes it worthwhile.
Dota 2 All the way... Tried many other games over the years, but nothings has stuck as much as DotA has.. Its been a good 7 years since I started and never looked back..
Right now its Lethal League. I first found out about it from some friends. Since then I have also seen a bunch of Dota 2 streamers play it as well, which is cool to see.
Far Cry 3-4, nothing like driving around and mowing down things in a vehicle to Zen you out. Okay that and Flower on PS4. Seriously. Don't hate appreciate.
My comfort game is anything casual and cooperative I can play with my friends, just being able hang out and not have to stress about anything.