InLikeFlynn, it seems to me that you’ve bought into the belief that Sony and Microsoft are propagating, that Nintendo is for children. If you looked at their game library, you’d most certainly see that isn’t the case. I’ll list a few games off the top of my head that aren’t geared towards children, and some that are even quite adult.
Star Wars: Rogue Leader
If you want to include third party titles:
Soul Caliber 2 (with Link)
And how about upcoming titles?
Metal Gear Solid: Twin Snakes
Resident Evil 4
Star Wars Rebel Strike
That’s just a very small portion of GameCube’s library, and which excluded all the titles you might deem “kiddy” such as:
Legend of Zelda: The Wind Waker
Mario Kart: Double Dash
Super Mario Sunshine
Super Smash Brothers Melee
Anyways, that’s a very condensed list, but I really hope you perform some research before you rule out a perfectly viable console (just so it’s known, I own all 3).