I don't think 3D World was better (though the multiplayer aspect was really fun), but I agree with you about some of the weaker aspects of Odyssey. Especially Mushroom Kingdom being so weak was a terrible gut punch after unlocking it.
Odyssey is a great game, but as far as Mario games go it's not that impressive. I think it's probably better than Sunshine based on the virtue that if you hate the hat mechanic, it probably won't ruin the game for you, but if you hate F.L.U.D.D. in Sunshine it will definitely ruin the game for you.
64 and both Galaxy games are probably better. And I also agree that New Donk City is an absolutely fantastic level. Contrary to seemingly most people, I really liked Wooded Kingdom though. Wasn't a big fan of Sand Kingdom.
