And that's fine. Obviously, I'm not going to stand here and argue about our opinions because theres no point in that really. It's just that the way the OP made it sound like Odyssey was the best thing ever created and 3D world was the worst PoS ever created rubbed me the wrong way.

I just wanted to show that OP shouldn't just assume that his opinion is fact and I'm surprised mods leave this bait title and OP up. Also, from looking at threads on neogaf and reddit (reading serious posts, not people who say stuff like "I hate the game but I never played it", I am far from being the only one that finds Odyssey underwhelming and repetitive to say the least. 

As I said, Odyssey is a solid 8hour experience. 3D world and other 3D Mario games are all solid 20-25hour experiences which is the big difference here... Again my opinion after 100% Odyssey and every other 3d Mario. 

You can't 100% Odyssey in 8 hours.

They achieve a different objective. And they both stand their ground fairly at that.

And I completely agree with you. And from there it's just a preference as in if you prefer platforming games or collectathon games. Both are great games, I just feel one wears off faster then others once you complete the main game. And that is probably simply caused by the type of game it is vs previous 3D Mario games. 

You are missing out!

It's a fantastic game.

Odyssey wears off way faster than SM64. The abundance of moons per kingdom takes off the intensity of payoff.

15-20 Moons per kingdom would have been sufficient. And that is for the bigger ones.

My exact point. Whereas every single previous 3d Mario game were incredibly fun and still felt fresh while going for 100% and felt incredibly rewarding. Odyssey feels like an incredible grind to go for 100%. Outside of the fun but short platforming bits inside the hat doors (which if you explore a bit in your first playthrough, your going to get most of them anyways), going for 100% is tedious and not very fun. In fact, I'd argue that going for 100% exposes the games biggest flaws that you probably won't feel when completing the campaign such as the formulaic structure of each kingdom (see one of my previous post). Trust me, I'm not just criticising for the sake of criticising, I've already 100% the game lol... Completed 100% every kingdom and got every purple currency and every moons. 

That, of course, is just my opinion. Again, I feel like Mario Odyssey feels amazing for the first playthrough but then quickly falls off a cliff when you go for 100% whereas, in previous Mario games, going for 100% and completing the bonus worlds was often the most fun and rewarding part of the game!

I guess we have opposing views on this, I found that the game gets much more interesting once the story is complete! Koopa racing is a lot of fun trying to find ways to cut your time. The moon rocks moons add some much needed challenge and yes there are tasks you need to do in all kingdoms but they're fun tasks.

Maybe it'll get less interesting as I close in on the last moons but so far at 500+ moons I'm still having a blast so there's much more than only 8 solid hours of gameplay bliss in there.

Hard to take OP seriously when its written in such a childish way. OP Assumes that everyone shares his opinion and that 3D world is somehow a bad game.

In fact, as someone who has played and 100% BOTH games with 30-40hours invested in BOTH games, 3D world is the best platformer by far out of the 2. Odyssey isn't even that good of a platformer, it's more of a exploration collectathon game then a platformer which makes for one of the most disappointing 3D Mario platformers I've played. Also, Mario odyssey goes for quantity over quality with so many moons standing out in the open and most moons repeting themselves from kingdom to kingdom. (see below) I also feel that even when getting a moon in a challenging platforming level, it will not feel nearly as great because it's undermined by the hundreds of other moons that feel completely useless.

Also, no one seems to mention how Odyssey is incredibly tedious and repetitive if you actually begin to go for all the moons. In fact, a post from Neogaf summarised the overall game incredibly well: "SPOILERS"

"Can we please discuss how utterly repetitive the activities are in each kingdom to collect the moon?

1) Koopa race
2) Ground pound the underground bump
3) Trace the lines
4) Ground pound these 1000 random glowing and non-glowing spots
5) Red door where you find two moons
6) Scarecrow
7) Captain toad
8) Peach
9) "Feel" haptically where you should ground pound
10) Buy in the store
11) Match-3
12) Get the costume and find it behind the locked door
13) Find the art and moon is there
14) Impress the female goomba
15) Look at the sail with the telescope
16) Spin cappy on glowing object x
17) Open the treasure boxes in the correct order
18) Rocket
19) Dog
20) Collect 5 golden moons to unlock the actual moon
21) Bring the seed to the pot
22) Do some random challenge to a 100 (i.e. jumping rope, volleyball)
23) 8-bit

http://www.neogaf.com/forum/showpost.php?p=253010139&postcount=53

Another thing, the lack of memorable music. 3D world soundtrack is far superior in my opinion. After playing Mario odyssey for 40 hours, I remember maybe ONE song. That's it.

Anyways, in my opinion, Odyssey is kinda similar to how I felt with breath of the wild. Incredibly fun at first glance and fresh. But then, you quickly realise that it misses a lot of the things that made Zelda games,.. Zelda games. Same thing here for Mario.

EDIT: Also, before anyone attacks me for criticising  odyssey. I bought the game digitally while I already had my physical copy shipped from Amazon just to get to play it 12hours in advance which means I bought the game twice lol.