You're kidding me, right? The Gamecube is much better than the PS2. If you think the Gamecube is only for kids, you must be really out of touch -- it has all the Resident Evil games now. All of them. That's six in total. Plus, there's Perfect Dark Zero, Die Hard, Eternal Darkness, Metroid Prime...
But then again, if you're still hung-up on the kiddy game issue, you probably wouldn't understand anyway.