Sun/Moon felt like a grand experiment. They were Gamefreak pushing the boundaries as much as they could and trying as much as they could likely in anticipation of the next games in the series being on the Switch and wanting to hit the ground running rather than being in a testing phase. Some of it worked, some of it didn't. I didn't mind Z-moves, but I didn't like the Festival Plaza. Alolan form pokemon were a cool idea I want to see more of (if for no other reason than it gives new spins on classic and popular mons and helps alleviate the issue of coming up with 100+ new mons every generation), and the idea of ride pokemon was a nice change of pace from HMs (though I might actually enjoy the idea of the ride mons actually being from your stock/party. Basically grant HM move type utility without the need to take up a move slot).
The biggest problem with Alola the area was that the separated island format made it seem a lot smaller than it really was. Kalos, on the other hand, I thought tends to get overlooked and underappreciated. It doesn't do anything spectacularly well vs earlier generations, but it does everything serviceably or better.
If I were ranking the regions (not the games on the whole. Just the structure and exploration of the regions/maps and whatnot), it'd probably be:
Kanto
Johto
Hoenn
Sinnoh
Unova
Kalos
Alola
1) Johto
2) Kanto
3) Kalos
4) Sinnoh (except for the snowy/marshy areas. That was bull****)
5) Hoenn
6) Alola
7) Unova
I want to get back into playing the games, but I keep putting it off because I have a buildup of legendary giveaway mons to finish claiming from all of last year (well, Jan-Nov). Guess I'm going to have to settle in and finish that up so I can get back to work. I also was playing a Platinum Nuzlocke last year until I wiped against Galactic Commander Jupiter. I'd like to do another Nuzlocke or some such thing again, but I'm not sure what. The Unova games haven't ever grabbed me enough to go back to them the more than 3 times I've played through BW/BW2 already.