I only use my Steam Deck while I am away from my gaming (Linux-)PC. The reasons for this are that for me a big screen wins compared to the small (and relatively low-res) display of the Steam Deck, and also the games I usually play play way better with mouse and keyboard than with gamepad input… Also, the Steam Deck is relatively heavy, so gaming in bed or stuff like that also isn’t that enjoyable…

That said, the Steam Deck absolutely shines in situations where I cannot access my gaming PC. I usually take it with me when I go for a longer train ride, and also brought it along for vacation.

Compatibility wise I am in the situation that all the games I ever tried are working on the Steam Deck, but that’s mostly because I have been using Linux exclusively for decades, and have made it a habit to check if a game is going to work before buying it. Though, in recent years that habit slightly changed, thanks to the work Valve has put into WINE development. While back when I switched to Linux most Windows games would not run via WINE, nowadays one can expect that almost all games do. It is still a good idea to check protondb first, of course. Also, there are still a few games that need tinkering to get them to run, and protondb usually has some info on how to do that.

One negative point I have to mention is battery runtime. It strongly depends on what one is playing, but very demanding 3D games can drain the battery in 1.5 hours. However, I am talking about the old LCD model here, the newer OLED models run longer with one charge (though I don’t know how long actually).

Another negative is the display resolution. Most games don’t mind running on 1280x800, but some do. This can lead to illegible text, broken UI, or, as is the case with Stellaris, a different UI that is less convenient to use.

And last, but not least, performance. The Steam Deck GPU is just enough for the built-in display’s resolution, and also only under the assumption that games are reasonably optimized. I have not yet been in the situation that I would have gotten unplayable FPS, but I have heard a lot about games only running with 20 FPS, and needing upscaling… So, basically don’t expect it to run Crysis (yes, I know that joke is old, and that the Steam Deck can run Crysis just fine).