I might be a minority here, but I play MH games exclusively on Steam Deck (Rise and World), so I was really excited to play Wilds on my SD, only to get disappointed.
So, I left the game for a few months.
I just returned to the game, and to my surprise, it works really well now. It's playable with good enough graphics now.
I just use the lowest setting, and turn off the frame gen and upscale.
I set the SD frame limit to 28 (that's just my lucky number that has been worked great for heavy graphic games, you can use 30).
I'm still early in the game, because it was literally unplayable before, so I wasn't able to progress.
I just finished a few quests. The frame rate dipped down once during the quests. Otherwise, it's very stable.
The graphics quality to me, is very similar to World on SD. So it's completely fine for me.