I think PS2 should be #1. Da best.

The Top 10 Video Game Consoles of the Decade…

10) PLAYSTATION PORTABLE
LAUNCH DATE: March 24, 2005
PRICE AT LAUNCH: $249.99
KEY GAMES:Grand Theft Auto: Liberty City Stories, God of War: Chains of Olympus, Lumines
PROS: A PlayStation 2 in your pocket (pretty much)! The PSP was ambitious. With few awesome titles and an unmatched number of features that we’ve only seen on home consoles, we were pretty happy with the little homie.
CONS: Unfortunately the Nintendo DS just had a better choice of games and while SONY consoles are great, no one wants a huge, low grade, 250 dollar mp3/DVD player.

 

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5) SEGA DREAMCAST
LAUNCH DATE: September 9, 1999
PRICE AT LAUNCH: $199.99
KEY GAMES:Sonic Adventure, Crazy Taxi, NBA 2K2
PROS: Ah, Dreamcast, we hardly knew ye. SEGA’S attempt at staying afloat was pretty awesome and in a way, ahead of it’s time. The graphics were on point, the games were awesome, and the memory cards were like Tamagotchi’s! *Cough, cough* except you know, manlier and for adults.
CONS: There was nothing really wrong with the Dreamcast, in fact we still have ours. It was simply a victim of poor timing. A little after its release, SONY launched the PS2 and it was just- you know, better.

http://www.complex.com/blogs/2009/10/23/best-of-the-2000s-the-top-10-video-game-consoles/