It's quite the opposite for me.
Although i've only played 5-6 worlds, the game so far feels dissapointing.
It's not what i expected it to be, and clearly not what i expected from Nintendo:
The 5-6 worlds i've played have just been full - like 90% of the time - with bland, uninspired locales. Only twice have i really felt amazed at what i saw.
That's a feeling i had while playing Mario 3D World... twice.
Personally, i think Mario could be controlled better (too movement sensitive); the water mechanic is just... weird. I still think Mario 64 controls way better.
The music has been a miss - again, clearly unlike Mario 3D World (had beautiful tunes!).
The possession mechanic is cool, but i think Mario 3D World did it better. Not the same thing, i know (considering the costumes), but it felt better.
One last thing - and remember that i haven't played the whole thing: the game is - and looks to be, as a whole - easy.
I have to pay to get a moon? I have a light showing me where stuff is - or a rumble for that matter?
The mini-bosses are too easy, aswell.
Yes, it might be a challenge to find the moons, but it rather have a DK like challenge, than something that i could look up online.
Mario Odyssey is clearly better in some parts, but as a whole, Mario 3D World wins.