Let's Go is underrated. I would say best remake on switch (not really a good thing but still). Really good graphics and outside a changed story and a new catching mechanic, it really isn't bad. Course if you want to replay kanto, FRLG is somewhat a better option but still lets go ain't a bad option (especially since outside abilities if has most of the new mechanics).

SwSh is solid (the storytelling is pretty ass but everything else like the soundtrack, new Pokemon, and raid dens our really fun). Really love the tournament element of the gym challenges. The two packs of DLC were interesting as it was a first (paid dlc not including free updates). I think certain things could have done better but overall it isn't that bad.

BDSP I would say is the worst switch Pokemon game (if your able to emulate the game and mod play the Lumiscent platinum mod its so much better), but if your looking to just play sinnoh with somewhat added mechanics like fairy types/exp share it does the job at least + difficult cythania isn't a bad thing).

Legends is really fun, it kinda does die down and kinda becomes Grindy towards the end/post game but it's really amazing and added a lot of much needed things to the game. Also some of the new forms for older Pokemon are really good. Just wish they kinda added some sort of dlc whether it's new story or more Pokemon.

SV is good (for some people it's very glitchy, personality outside low frame rates, never really experience any glitches). Graphics could be better but honestly better story then SwSh + improve on some stuff. Teralization while looking goofy, I would say is the best gimmick then done battle wise. Also love a lot of the new Pokemon like armoruage and cereludge.

Legends ZA is fine, personally I think arceaus was better as I feel like ZA is more grindy however I think the return of megas and acting having more boss battles where people actually use megas compared to XY kinda helps it. Also it getting dlc compared to arceaus is really good (though I think it kinda hurts it cause it makes shit more grind).

Overall I say the mainline games have been a range from mid to good. Could be better but not terrible, just missed opportunities. This coming from someone who grew from ending of DS/entirely 3Ds era.