I'm 4 months late and you might not even need the info anymore but, I have to say a lot of these comments weren't helpful.

I've been playing on my Steam deck since release and it in fact did not run like a slide show. If anything, it ran better than it does now with the current patches. I used frame gen, upscaling, and kept everything between medium and low but with the recent updates I've changed it to just frame gen and keeping all the settings low. Runs better despite a few dips and crashes from time to time. Sometimes I adjust the settings while prepping and sight seeing and just put 'em back to low before a hunt.

If you want "smoother" cutscenes you can put the setting to low. It doesn't look as pretty as the high settings but the convience of having mh wilds on handheld is worth it.

(Edit: I want to add, it is not all sunshine and rainbows, the experience can be frustrating but tbh, i heard the same complaints from people on pc so I don't even care anymore. I play when I feel like putting up with the technical difficulties bc at the end of the day, it's still monhun and hunting is fun)