Personally, I think the graphics on SS and PLA look fine.
SV is a bit iffy, but the actual character/Pokémon models look superb.
SwSh and SV all have the same problem of being unable to load the Pokémon fast enough in the overworld when you sprint on your bike / sandwich machine, with the former also not loading berry trees fast enough weirdly.
But in the non-open areas of SwSh I agree it looks fine. PLA is empty but I like its aesthetic more.
SV’s Pokémon models are definitely a lot better, you can even see the fur on Pikachu!
A lot of BDSP actually is really nice to look at, there’s just so much disappointment. Like the fact that its simultaneously somehow on a grid like the originals, and not, so you end up bumping into corners when it looks like you’ve gone past them (I find this a particular problem in the Grand Underground - a similar thing occurs in SV where you encounter a Pokémon that’s a couple metres off to the side, and the game just jumps you to it). Or that they didn’t give us walking Pokémon inside, in caves, or on snow - which is a LOT of the map! The in-battle models seem the same as SwSh which is fine, and the backgrounds are significantly nicer to look at than SwSh.