Personally, I rely on more powerful hardware (laptop, in my case) to play anything the Steam Deck can’t at full speed. A lot of the more demanding AAAs not only run at an inconsistent 30fps, but require potato settings to get there. Now, I do have more powerful Windows handhelds, but if I have choose between the convenience of SteamOS with several hours of battery life vs Windows jank with 1 hr of gameplay max, I’m taking the Steam Deck every time. I’m playing through Last of Us Part 1 right now, and while it doesn’t run well on Steam Deck, running it better on the ROG Ally will mean I have to be tethered to the wall. At that point, I may as well just use a laptop which will run it much, much better.

Tl;dr No handheld plays all games well. Handheld Windows is atrocious. Use Steam Deck/SteamOS for anything it does well, do the rest on a laptop.

My brother asked whether a Steam Deck was worth it literally the day before the OLED was announced. Well, can’t complain about free.