Since I've beat the game, I can probably give my two cents.
The story was definitely lackluster; Hop annoys you even 2 seconds, Leon is constantly on your throat how undefeated he is and how Charizard is the best, Team Yell is a huge step down from what made Team Skull charming, and the overall plot just felt it was scrambled with no thought at all. Not to mention any of the characters got barely any development. I was basically mashing A throughout the entire story (I am a fast reader so I got a lot of the information despite skimming).
The presentation is alright. While some of the towns look stunning, many other parts of the game looks unpolished; bad textures (besides the N64 trees, the rocks and grass to name a few), empty battle backgrounds, background changes in battle when you are in a different area (i.e. battle on a big bridge but the background shifts to plains), pop-ins are constant and a nuisance, scaling of models (Wailord and Eternatus), the crammed spaces in battle, and the exploration feels limited and empty (cities, routes, and dungeons are all linear). Besides some of the new move animations from the new Pokemon, the Pokemon animations are laughable because they are all copy and pasted from games on the 3DS, a huge slap on the face since someone's favourite Pokemon most likely got cut for the "better animations" excuse. Pokemon in the overworld is a welcome change but they all feel lifeless except when they interact with your trainer. The cutscenes feel like a step down from the Gen 7 games and it's 2019 why is there no skip cutscene option yet? Luckily, the music is solid and fits the atmosphere well; it definitely gives me Gen 5 vibes.
As for gameplay, I still had some fun with it since it is a Pokemon game at the end of the day and I do not feel the whole Pokemon formula needs to change because that what makes these games basic, timeless, and charming; there's nothing wrong with them always being turn based RPGs, I love turn based RPGs. However, I did not like Dynamax one bit, it's far too busted and it doesn't add to anything. If anything, Mega Evolutions should have returned, while it did make some Pokemon broken, it helped make some more Pokemon viable. I haven't touched the game in a month (except for a trade and mystery gift) but apparently the post game is kept to a minimum. QoL changes are definitely a welcome change.
Overall, I felt the game was average at best. I didn't think it was as bad as I anticipated but I do not think these games are praiseworthy either. I feel the franchise deserves a better Pokemon game to match with the quality of other games for the Switch.