Favorite sixth-generation-era platformer series?

3D action/platformer games reached their popularity climax in the sixth-generation. Their kid-friendly-but-also-edgy art-style was pretty cool back then. I really miss them now. They are pretty rare these days, and even old series like Ratchet and Clank or Banja/Kazooie aren't classic platformers anymore.
Some of the series from the golden age of 3D platformers include:

• Jak and Daxter
• Ratchet and Clank
• Sly Cooper
• Ty the Tasmanian Tiger
• Nintendo GameCube platformers, like Wario World and Super Mario Sunshine  
• and the list goes on

What is your personal favorite? Mine is Ty the Tasmanian Tiger, I always felt those games were underappreciated. I still pop the first one in my GameCube once in a while and play a few levels. I love those games.

Damn it, I can't really name one. Viewtiful Joe comes to mind, but that's about it.

Pyschonauts isn't really a series, but dammit it should have been. Stupid low sales :(

I really love the Sly Cooper series. 

The original Jak and Daxter is awesome, but as a series, Ratchet and Clank win.

Metroid Prime 2 Echoes is the best platformer of the previous generation, bar none.

Psychonauts is a close second.