The worst problem was how the game was a carbon copy of Gen I to cater to Gen I fans, but also dumbed down to cater to young kids... resulting in a target audience of those who were six years old in 1996 and are still six years old today. PLG fell so completely between two chairs it's hard to see what they wanted to do with it. The game could have been better for older fans by being a faithful remake without all the dumbing down and maybe something extra for the long-time fans, or it could have been a better kids game if they decided to ditch Kanto and take advantage of the Switch's capabilities to create a new and exciting region - which older fans presumably would want to check out, even with a general dumbing down. At least they would have avoided this whole "worse than the games it tries to recreate" thing.Let's Go Pikachu and Eevee in my eyes was a waste of space that seems to have been made to cater to the older fans. I've always felt this catering in the past, what with Mega Evolutions being directed for a majority of the Gen 1 Pokemon and the Alolan formes only being from Kanto, but honestly he fact that they made yet ANOTHER kanto remake stands out as the worst genwunner catering. Look it guys, gen one just ain't that good, it's nostalgia talking.
PLG tried to do two mutually exclusive things and ended up doing both of them poorly. It sold well because of brand reputation, but it also put a dent in that reputation which it will take some major effort to smooth over. Game Freak cashed in a lot of their goodwill with these games, hopefully the next ones will make an effort to restore it.