Overall I think this is a weak set of starters. I really like the Grookey line, and there's a good chance it would've ended up on my team whether it was a starter or just found in the wild. However, Intelleon is possibly the worst starter we've ever had, close to Primarina (sorry Water-Type fans, the last 2 gens have shafted you). Cinderace is in the middle of "not for me, but I can see why someone would like it". None of the final stages of the starters seem to appeal to girls much, which breaks tradition, but I think they may have wanted Intelleon to be the design that appeals to girls and they just failed. I sent these designs to a groupchat with some casual Pokémon fans in it -- most of them are girls and all of them said Intelleon is the worst.
I don't see why these are monotype. Grookey should be Grass/Rock, Intelleon should be Water/Ghost (we've had ghostly properties become full Ghost-Type attributes in the past such as with Jellicent), and Cinderace could be either Fire/Electric or Fire/Ground. All of these type combinations would be up until now rare combos and they all make more sense given the designs we have than them being monotype. It doesn't necessarily detract from the designs, but Grookey and Cinderace in particular look more like Grass/Rock and Fire/Electric types than they do monotype Pokémon.
In my ranking of starters, I would go 3, 4, 2, 8, 1, 7, 5, 6 -- 8 and 1 are perhaps interchangeable. Regardless, I would say this is the best set of starters since the "new" era of Pokémon beginning in gen 5, and that's exciting to me.