A decade ago I was already firmly away from playing games under Windows.

World of Tanks, SW:TOR (IIRC), Warcraft III TFT, SW: KotOR I and II, Jedi Academy and Jedi Outcast, X-Wing Alliance, X-Wing vs TIE Fighter, Empire at War, older Paradox games and a few others ran fine for me under Wine. I'm not sure if I had Rome: Total War working back then (definitely ran Medieval II: Total War with a few heavy mods later), I think at some point RTW worked fine. Well, also Galactic Battlegrounds (again Star Wars) and the second Battlefront (again Star Wars). And Battle for Middle-Earth I and II (these are boring), and War of the Ring (that one was and is really good), and some little-known space station manager game from a Russian studio, and likely some other things. Ah, also Star Wars: Rebellion without tactical space battles (would crash on these).

It wasn't a viable OS for gaming for adults, but for teens with interest in Linux - no problem at all.