I liked everything, really. I'm delighted with everything in store here.
The new Pokémon just keep getting cooler the more I see of them - all the nice and/or ridiculous little details that you see in camp and in battle animations are great to look at (Appletun's flippy eyes, Inteleon's contact move animation that looks like bar fighting, Cinderace falling to its knees as if it scored a goal...).
I adore Rookidee. Blue tits are everywhere at grandma's house in the country and they are THE songbird for me (and shiny Rookidee are great tits, just as common).
The region looks beautiful. I sometimes just stop and admire the scenery, not just in the Wild Area. I really like the Wild Area itself - it's well thought out and gives you a sense of adventure and discovery. I'd sometimes imagine a whole field of tall grass and lo, in Bridge Field it was actually there.
Max Raids are fun, especially with actual people. Camp too - I love Pokémon camp, playing fetch and cooking, and visiting too. I got visited by a Trainer with a shiny Dragapult one time.
EDIT: Also loving the soundtrack so far (I look forward to the Gym Leader battle theme every time), but I'll listen to more of it once I finish the game for a more detailed opinion.
All in all, I'm really enjoying the game!