But after a few days it was clear this was something special. Why? For me it's my 'forever console'. Access to my full Steam Library was one thing, but having basically every retro console at my disposal is unreal. Just last night I played a game of M.U.L.E. and StarRaiders on my Atari800 emulator. That was after a couple of rounds of MarioKart on SNES, then Pilot Wings on 64 and then some Resident Evil 4 on GameCube.
I also love that so many older PC games just work on it. I recently replayed the entire Mass Effect Trilogy on it (absolutely the best experience playing that game, something about the controls, the screen and it on my lap was just too fun). Ditto on Dark Souls 1 and 2 which I also just replayed (and yes Eldin Ring runs unreal on it, somehow).
The only real surprise is that Dead Space doesn't run on it, I have a hutch they'll get it sorted out (sorta like they did working with FromSoftware on Eldin Ring).
Lastly, the other major advantage for me is the ability to return games. This is an unheralded Steam feature that's a really great. I buy games I wouldn't even consider on PS-whatever/Xbox because you're screwed if you don't like it. Hell my 2 year old son managed to buy the new COD on PS5 by mashing the controller unsupervised for a few minutes and there is no way to return it, at least not easily; I tried for about 20 minutes before giving up.
Long/short - SteamDeck is something special, it plays a ton of modern games flawlessly including Eldin Ring, and is a retro-gaming dream-machine, plus Steam has a great library and the ability to return games after trying them is the final cherry on-top.
PS: Anyone want to buy a PS5?