80 for Pokemon, 92 for Smash.
I think Let's Go will get some good reviews, I don't see many reviewers giving it an outright mediocre score - it's a beginner's Pokemon, and that much is clear by now.
Smash Ultimate is interesting too - Smash isn't quite as universally loved by critics as 3D Mario and Zelda, so even with the sheer amount of content this game has, I can't see it breaking in to the mid-90s the way those franchises do.