I wonder who's voting for the SNES in the poll...

1) SNES (highest quality 3rd party games IMO and had quite a few of them)
2) NES (had lots of 3rd party support but the NES showed its age for a lot of games)
3) Gamecube (like someone else said, was comparable to Xbox for a while)
4) Wii (the real wild card; had some amazing games but 3rd parties tended to go the shovelware route)
5) N64 (lulz)
6) Wii U (more lulz)

1. NES
2. Super NES
3. Wii
4. Nintendo 64
5. GameCube

Your list is perfection. Poll almost perfectly agrees with you too.

Looking back, the N64 had almost zero high quality third-party titles. I think thanks to its indie support alone, the Wii U has bested it there. I can't think of anything comparable to Shovel Knight on N64.

Exactly what you have here.  The NES is clearly #1.  It had all 3rd party support pretty much exclusively (it even had some Sega 1st party games on it... and Sega had their own console at the time, lol). 

The SNES had excellent support. 

Gamecube had decent console parity with Soul Calibur, Splinter Cell, Prince of Persia, Tony Hawk, Madden, Phantasy Star Online; superb timed exclusives in Resident Evil 4 and Viewtiful Joe; plus full exclusives with FF:CC, MGS:TS, RE0, and the outstanding REmake.

Wii tops N64 because of the massive popularity of Guitar Hero and Just Dance. 

And WiiU is definitely last.  EDIT:  I didn't consider WiiU's indie support; WiiU may actually best the N64.  :O

Wii U is clearly the worst.

This is pretty easy. Snes had by far the biggest third party support of all Nintendo consoles. Snes had tons of third party games, most are pretty good. Sad that a considerably number of these games were released only in Japan.

1-SNES
2-NES
3-N64
4-GC
5-Wii/Wii U tie

1.) NES (can't beat *total* exclusivity on almost every third party game)
2.) SNES
3.) GameCube
4.) N64
5.) Wii
6.) Wii U

Wii U started off good, but just fell apart once the launch went sour and Zombi U failed to sell to expectations. 

Another thing to consider is the Virtual Console. Take a game like Mega Man X -- released originally for SNES, it represents Capcom's support for that platform. But it was also released for the Wii (and, later, for the Wii U) through the Virtual Console. Is this not representative of some manner of support for those consoles? Even if we were to disregard this game and many others simply because they were already released on a previous Nintendo platform, that does not account for the handful of Sega Genesis (among other retro platforms) titles such as Sonic the Hedgehog making their Nintendo console debut.

There's no denying that to support the Virtual Console is to support the platform that is host to it. But I don't know how we can measure this support against actual newly developed titles of varying quality. Considering all of this, I believe the Wii might actually rival the GameCube in terms of third-party support, while the Wii U quite simply blows the N64 away.

Please, someone offer a legitimate reason to consider the N64's third-party support superior to that on Wii U.