I gotta say since picking up the steam deck I'm loving this thing. I've used it on train rides to visit my family and time went by so damn fast.
I've streamed from my pc on it and it ran flawlessly while being close by. Gotta try some other streaming test though.
I've run/installed some games on it and they all worked good or great, cept Starfield, but that game seems to make your pc really work. I will say though for me it was playable. I do however have a history of playing games my pc can't normally handle over the years and have been known to play games going 16 to 18 fps. Starfield ran mid 20's to 30 fps with lowered settings, but on a small screen it looked better then on a 32 inch tv.
Diablo 4 runs great, Tekken runs amazing, Fallout 4 was great, Cyberpunk through Epic Store *used Heroic* seems to run solid and looks good. Skyrim is a blast on there.
Also as for Diablo 4, some people seem to put this game in the ringer and I've seen some people make the comment about always having to be online, which it does, but then they mention they're doing back to D3..... which is always online. lol
I'm loving D4, it feels like a cross between D2 and D3. I'm enjoying it and I gotta say I love that they have the gamepad/controller setup for use on the PC. I just hate though how they have a button to use for dodging. They should of did it like the console version of D3 where the right joystick dodges in the direction you push. Would free up that button for another skill to use. Seems kind of dumb.
Also this game screams couch coop with two controls, but that ain't ever gonna happen sadly.