Right kind of DVD? You mean, one with a barcode or something? Would that allow you to play burned games on an unmodded PS2?

But yeah, shadow sucks. I'm not a particularly big fan of sonic since the 3d days, but I've always seen a similarity between megaman and sonic -

sonic = megaman (the good guy, both are blue)
knuckles = protoman (the rival, both are red, because red is the opposite of blue!)

and when the rival becomes a good guy, they need a new rival, so shadow = bass (both just happen to be black, because nothing is more evil than black).