I am one of those who finds this absolutely fascinating and am actually considering buying one later on down the line (say, Q4, when the most surgent issues are fixed and early bird/Q1/Q2 preorders are out).
I am not a hardcore gamer. I have a 1 litre mini PC with just enough juice to run PS360 games and older retro games (which is my forte). My console: A used up X360 with way too many games i still need to play. By all means i am a gamer who does not want the most expensive gear to have a good time (To the point where i would consider a now still hypothetical HP Elitedesk mini 1 litre PC with Rembrandt APU to be the machine for me when it comes to simple yet effective gaming).
Getting what is essentially PS4 one performance at 720/800p means PS360 games will mostly fly (Enslaved still drops from 60 fps but okay) and for the base price of 399, where ill just shell some extra dough for a large SD card, that is rather a steal.
So consider me fascinated. Even with the suboptimal screen, i am more than forgiving considering what it can pump out. In a way it reminds me of the Sega Nomad and Atari Lynx - Also huge handhelds that held amazing power (And when it came to the Lynx, it actually beated certain consoles at the time) at the cost of battery.
If that is what makes you consider cancelling, then you have had unrealistic expectations in check. Valve made it abundantly clear that the Steam Deck is mean't to play PS4/XBO and a little beyond games at 720p/800p resolution at 30 FPS - And it achieves this mostly so. The closest current-gen competitor to this is the Series S, so it will be interesting to see how the Steam Deck will fare against the Series S versions. Sometimes these get hamstrung, but perhaps if Steam Deck is succesful, devs will optimize more for the Series S aswell - Which is a steal for the price it has.
That's literally what the Steam Deck can do. And again, the console is primarily made for 720/800p gaming on PS4/XBO equivalent titles. That it beasts Doom Eternal at Ultra settings at 60 fps is such a far cry (heh) from the Switch version at 720p (and lower) at 30 fps. It is a monumental leap in handheld gaming.
Again i feel your expectation is unrealistic, and that's not something Valve can solve.