

One has to be Crusader Kings III considering the amount of time that died in that game. I did Lingua Franca (world domination) when mods and savescumming voided achievements, my whole empire fell apart literally 20 seconds after I achieved world domination lol, could barely hold it together to achieve the feat.
The other one is probably Rocket League. Low skill floor, skyhigh skill ceiling, wonderfully designed esports game. If you could still freely go in and out of casual games, I‘d probably still play it. But I peaked and don‘t feel the need to play ranked anymore and casuals started to feel like ranked.
After these two I can probably name ten more but I can‘t say which takes a top 3. League of Legends, Counterstrike 1.6, Battlefield 3, HITMAN, Dark Souls II (yep lol, I could probably draw a map of this game from memory), NIOH 1/2, Monster Hunter World, Sleeping Dogs, Muse Dash, all these games killed countless hours with fun, but it‘s hard to put one above the other. Apart from League of Legends, that one takes the rear.
Can you elaborate? Would jacking up the graphics, animations, and sound mess with the atmosphere? It‘s been a hot minute since I‘ve played it so I‘m not sure what the issue would be.