Lo, for behold, in 6 years time, we shall celebrate the 20th anniversary of the Virtual Boy's release. Bow before it's red-and-black-ness!
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While I will not contend that many things look better through the rose-tinted lenses of nostalgia, DC introduced a great many things that we do take for granted, and while every system has crap games, the true gems will always shine through regardless of the console (I'm still holding my breath for a wii killer-app though). This was also in the dwindling days of the bit-wars, and I personally see it as a shift from gameplay-to-graphics focused games. Despite possibly not fully living up to the hype created for it, the PS2 did usher in an era of cinematic-style gaming, even when technical specs didn't allow the illusion of "OH CRAP ARE WE PLAYING FOOTBALL OR WATCHING A LIVE GAME" as we do these days. Dreamcast was also absolutely able to deliver visuals on par with much of what the PS2 had to offer. Dreamcast was first, but things like controller design and a lack of DVD definitely sang it to an early grave. Poor decisions that Sega made, and they definitely paid for it in the end. Sony made poor decisions with the PS2 as well, like a lack of built-in internet, and Nintendo wasn't exempt either, but in my opinion the sheer amount of things Sega did RIGHT with the Dreamcast influenced gaming as we know it today.
So, while for some it was no big deal, for others, remembering the Dreamcast today is our way of paying respect for hours of gaming goodness and showing our appreciation for continued innovation, even from the underdogs who leave.
Edit: Also, I despise most fanboys. Someone should make a list of "you know you're a fanboy if" jokes.
Edit-Edit: Furthermore, The Damned, do you think any Sega fans WANT to move on from Dreamcast's glory days? What have they done since that really tops that? Sega, for many, represents a console-and-game maker, not just a game maker (or rather, not just a crummy game maker). It's the same reason Sega still makes those "collections" of old games, just like Atari...and Namco...and Taito...and Midway...