Critics won't be nearly as turned off by Let's Go as some fans are. It's a pretty, more accessible version of gen. 1. I'd be very surprised if it gets lower than 75 and would actually predict low 80s.
Smash might start to suffer from franchise fatigue. I saw some outlets lower the score of Smash Wii U in 2014 because they had grown tired of the formula,and I suspect that trend might continue here even if has more content and more refined gameplay than previous versions. So low 90s to high 80s; I think a lot is riding on the spirits system really taking off since they're dropping trophies, which is a huge mistake in my opinion.