Quote: I'm gonna vote DC because I've had the most fun with that one.

Sonic Adventure, Soul Calibur, Crazy Taxi, Jet Grind Radio, Virtua Tennis, DOA2, Chuchu Rocket, Tony Hawk 2, NES Emulator...
Although really, there are a lot of good Xbox games. Halo, DOA3, GunValkyrie, Jet Set Radio Future, Panzer Dragoon Orta, Project Gotham, Rallisport.... And a lot of the better PS2 titles get ported over anyone, so I honestly don't have much of a reason to buy one. Metal Gear Solid 2, Silent Hill 2...
I did pick up a Gamecube though. It's got a couple great titles... just not enough. Metroid Prime is damn good and The WindWaker is pretty good (even though it gets pretty dull near the end).
I'm voting Dreamcast, though, because it blew me away when it first came out. Xbox is the superior console, sure, but it's not the amazing step up that Dreamcast was. The graphics were astounding and still hold up very well. The controller is well-designed and the entire thing looks slick as hell. The modem was very important, too...
Though the Xbox added some nifty stuff (hard-drive ROCKS), in many ways it's like the Dreamcast successor. It's got a built-in modem and a number of online titles. It's controller is a lot like Dreamcast's, with a few extra buttons and a second analog stick.
The Gamecube and PS2, I feel, are the least innovative of the bunch. Sony included a DVD player - a good move that I'm sure helped out their sales a lot - but they completely neglected many aspects of the system. It's controller is exactly the same as the PSX's Dual-Shock. It's still got two freakin' controller ports. It sucks up memory cards. It doesn't come with a modem or a hard-drive or anything slick. It's freakin' pathetic, and Sony should be very thankful that there are good games and they have a smart head in marketing. The Gamecube may not be as lacking as the PS2, but I still wish it had a modem and a hard-drive and having to buy add-ons won't be any fun. I do have to give it some credit for it's wireless controllers though.
Yeah.