I didn't enjoy Pokemon Let's Go Pikachu and Eevee. They're just garbage. They're overpriced, lazy, lack of content (especially post-game) and overall just a cash grab. You can't even catch Mew unless you pay.
Let's Go has no held items, no abilities, no Pokemon Day Care (meaning there's no egg moves or breeding for good IVs) and it doesn't have the Sevii Islands, the Pokemon Tower or anything worthwhile in the post-game. In FR/LG you could trade with R/S/E to obtain more Pokemon from Hoenn and Johto, which is also exempt from Let's Go.
Like I said they're just a cash grab and they offer no comparison to the original GameBoy Advance Kanto remake (FR/LG).