1. Super Mario World
2. Super Mario Bros. 3
3. Super Mario Galaxy
4. Super Mario 64
5. Super Mario Galaxy 2
6. Super Mario Bros. 2
7. Super Mario Sunshine
8. New Super Mario Bros.
9. Super Mario 3D World
10. Super Mario 3D Land
11. New Super Mario Bros. 2
12. Super Mario Land 2: 6 Golden Coins
13. Super Mario Bros.
14. Super Mario Land
15. New Super Mario Bros. U
16. New Super Mario Bros. Wii

I'm just going to vote based on what I've but a lot of hours in:

1: Super Mario World

2: Super Mario Sunshine

3: Super Mario Bros 3

4: Super Mario 64

5: Super Mario Bros (OG)

6: Super Mario Galaxy (1)

have hardly played Galaxy 2, don't like Mario 3D Land or 3D World, and the 'New Super Mario Bros' series I also never liked enough to play much of at all (the Wii motion controls didn't help with that).

note: while I like Yoshi's Island, I don't really consider it a 'Mario' game per say, especially in how it controls. Also the original Gameboy Mario games (Deluxe and Mario Land) are kind of unfair to compare to mainline games imo.

hyped for Odyssey though.  Hopefully Nintendo can bring Mario back to a return of form as far as overworlds and world charm are concerned. I feel like Mario 3D Land and 3D World lack the endearing qualities of traditional Mario games... they feel stale and as if the world is absent. Granted they're not really the open world formula, but even when compared to the original games on the NES or SNES they seem to lack charm.

if Odyssey has a great overworld and actually builds a bit of the world that would be stellar. No one wants just a million pipes without any funny and mysterious background things to explore 

I used to prefer Mario spin-offs to the main series games, but lately Nintendo has been doing a pretty awful job with all of them not named Mario Kart (and even that one still has issues). The mainseries is fine and all, but they really should take better care of the spin-offs. Anyway, I actually haven't played all that many of the older Mario platformers, but I don't think it'd change my top 5.

1. Sunshine
2. 3D World
3. 3D Land
4. Mario Maker
5. Super Paper Mario (it's a platformer so it counts!)

Just counting the mainline 2D/3D Mario platformers. No Kart, Sports, Maker, RPG, spinoffs (Yoshi, Wario) etc..

1. Super Mario 3
2. Super Mario World
3. Super Mario 64
4. Super Mario Brothers
5. NSMB Wii
6. NSMB U
7. NSMB
8. Super Mario 3D World
9. Super Mario Galaxy 2
10. Super Mario Galaxy
11. Super Mario 3D Land
12. Super Mario Land 2
13. Super Mario Land
14. Super Mario Brothers 2
15. Super Mario Sunshine
(haven't played NSMB 2, though I'd wager it'd be towards the bottom based off what I've seen)

Hopefully Odyssey claims a spot near the top of that list. I have a strong feeling it will, if it's anything like Zelda BotW..

I knew you were a lost soul Ka-pi, but not this lost.

I will list only games I've played:

1) Super Mario World (SNES)
2) Super Mario Bros (NES)
3) Super Mario Bros 3 (NES)
4) Super Mario 64 (N64)
5) Super Mario World 2 (SNES)
6) New Super Mario Bros Wii (Wii)

Super Mario Galaxy
Super Mario Galaxy 2
Super Mario Maker (Let's not forget this)
Super Mario World
Super Mario 3d World
Super Mario 64
Super Mario Bros. 3
Super Mario 3d Land
Super Mario Bros
New Super Mario Bros. Wii
Super Mario Sunshine
New Super Mario Bros. U
New Super Mario Bros.
New Super Mario Bros. 2
Super Mario Land 2
Super Mario Land
Lost Levels.

Best:Mario
Worst:Mario

1. 3D World Wii U
2. NSMB U Wii U
3. NSMB Wii

1. Super Mario Galaxy (Wii)
2. Super Mario Galaxy 2 (Wii)
3. Super Mario World (SNES)
4. New Super Mario Bros. U (Wii U)
5. Super Mario Bros. 3 (NES)
6. Super Mario 3D World (Wii U)
7. Super Mario Sunshine (GC)
8. Super Mario 64 (N64)
9. Super Mario Bros. (NES)
10. New Super Mario Bros. Wii (Wii)
11. Super Mario 3D Land (3DS)
12. New Super Mario Bros. 2 (3DS)

Did not play:
Super Mario 2 
Yoshi's Island 
Super Mario Land 
New Super Mario Bros 
Yoshi's Island 
Super Princess Peach 
Super Mario Land 2
Wario Land
New Yoshi's Island 

Man, I am going to get a lot of shit for my rankings for some of these. (New Mario U > Mario 3; 3D World AND Sunshine > 64)