Just loaded up Halo Infinite on PopOS and it ran flawlessly. I'm blown away, and am now looking at moving up my plans to switch away from Windows for my desktop. The future of Linux gaming is bright!
I wasn't even using Wine. I installed it and launched through Steam and the entire process was as seamless as if it were on Windows. Valve is doing great work.
I didn't try MCC or multiplayer, since I was just performance testing on the computer (will eventually be the wife's machine after we move next month), but even running Academy with the bots was running great. I was able to sign into my Microsoft account no problem though, so I want to try multiplayer next.