I think it looks... y'know, fine. Some bits look nice, others surprisingly ugly. Overall I feel like the Let's Go games had a more appealing look, plain as they were, just because that particular low budget 3D, no AF/AA, muddy textures look of S/S can be such an eyesore, but it's not something I'm going to boycott the game over. To call it one of the best-looking games on the Switch is just nuts, though.
The argument that "Game Freak is a small team, the games are low budget, it's an annual release so you can't expect too much, etc etc", is so weird when the obvious answer is just, like, OK spend more money then. These games sell Call of Duty numbers, why not give them Call of Duty budgets? I mean you can't say that THE POKEMON COMPANY doesn't have more money to spend on them. Hire more people. Increase the budget. If they absolutely must be annual games, then do what the big Western annual franchises do and set up multiple teams running on staggered cycles. The idea that Pokemon games can't be any better than this is a problem they've created for themselves.