Battalion Wars is on Wii as well.

Gamecube has the best Zelda, the best Metroid, the best Smash Bros (between Wii & GC at least), the two best Resident Evil, the best Mario Kart, the best Tales of, the best (and last) F-Zero, the second best Paper Mario (behind the 64), the best Fire Emblem.

It also has the best third party deals, as Viewtiful Joe, Skies of Arcadia, Star Wars Rogue Squadron or Killer7. It also has freaking good new and fresh IP, like Pikmin 1&2, Baten Kaitos, Luigi's Mansion, Eternal Darkness, Chibi-Robo...

The Wii is an excellent console, but the gamecube is far far away from it. Its only failure is the lack of a good 3D Mario Game.

We just had this thread like two weeks ago. I guess I will repost:

In general, the GameCube is pretty underrated as a console.  It didn't sell as near as much as it should have.  I remember in college (around 2007 I think), one of my friends asked me what must play games did it really have?

Then there are discussions online like this, where it gets massively overrated.  Nintendo's best?  Not even close.  Even if we do limit it to the home consoles only.

Let's start with the pro's:

• Arguably the best traditional controller ever made.  Still the most comfortable I have ever held.  Plus the Wavebird was an amazing wireless controller.
• Great hardware for the time.  Outclassed the PS2 pretty easily.  Not quite as powerful as the Xbox.  Still, developers like Factor 5 showed it was a powerful little beast.
• Last Nintendo home console with pretty universal third party support.  Got pretty much all the big multiplats, and even a few exclusives.
• I personally like the form factor.  Did get some criticism about being a "purple lunch box".

That is some good stuff there.  But when I go to the negative, it is all pretty much the games:

• Super Mario Sunshine - Don't get me wrong, I had a lot of fun with it.  It is a worthy Mario platformer, even if it is a little strange.  But a gimmicky follow-up to Super Mario 64 was not really what people were looking for.
• The Legend of Zelda: The Wind Waker - I think it is a beautiful game.  But let's not act like the art style didn't turn off a bunch of people from this game.
• The Legend of Zelda: The Twilight Princess - The OP includes this game, but let's be honest, this is a Wii game.  It launched first on the Wii in every region but Japan (where it launched same day).  It sold far more on the Wii.  Plus, the GameCube was pretty much done by this point.
• Starfox - I never played them, so I don't know if they are good.  My general immpression was they don't live up to the 64 game.

I don't have anything bad to say about the other games listed by the OP.  Metroid Prime and Pikmin are indeed awesome.  Yes, there are a bunch of awesome third party games (Star Wars, Eternal Darkness, etc.).

But let's compare this to the Wii for a second.  The Wii can play all Gamecube games, plus has the Virtual Console, plus WiiWare, plus (last but not least) Wii games.  Wii beats it hands down.

Games wise (just speaking for me here)?  Galaxy beats Sunshine.  Twilight Princess plus Skyward Sword beats The Wind Waker (2 vs 1 isn't fair).  Brawl beats Melee.  MK Wii beats Double Dash.  Prime Trilogy beats just having 1 and 2.  Plus the return of 2D platformers with NSMB and DKCR.  Plus a bunch of cool Wii games (Sports, Sports Resort, Fit, etc.).  Not to mention the Wii had a bunch of 3rd party gems if you were willing to go a little outside the box.

And for those saying Wii was just a casual console?  They are just blinded by their hate for Wii Sports and other motion control games.  All of Nintendo's flagship core titles are there.  Are a few smaller titles missing?  Yes.  Did a few others come out the the GameCube never saw?  Yes to that too.

And I still don't think I can call the Wii my favorite Nintendo console.  Both the SNES and N64 were awesome too.  I hate to say it, but the GameCube might actually be Nintendo's worst home console.  Which, come to think of it, for my favorite console of the sixth gen, maybe that just means the sixth gen kind of sucked.

GameCube wins, fatality.

not very convincing argument.  I've been playing on Nintendo consoles since the NES as well, and the wii has tons of games for core gamers.  I'm sorry if you didn't dig enough to find them, or maybe your tastes have narrowed or your interests lie in graphics.  Maybe you don't like Japanese games, but then why buy a Nintendo console.  I'm not gonna go into list wars, but the list is quite long of core games on the wii and Nintendo absolutely didn't abandon the core gamers are many have pointed out with long posts already in this thread.  

Hard to say. Maybe slightly better in terms of the games. But then Mario Galaxy and Xenoblade Chronicles count as about 5 good games each.

The Gamecube was the Tessaract in the Avengers.

Wii was better. It had ports of some of Gamecubes best games (arguably better ports) Metroid Prime Trilogy, RE4, it also had straight up ports of the rest of the RE games, not to mention it's Mario games win hands down (Plus having a 2d MArio), MKWii >DD, SSBB >SSBM, the Fire Emblem were about the same, it had Donkey Kong which GC didn't have, better Kirby's, GC did have a better Paper Mario though. I also preferred Skyward Sword over Wind Waker. Gamecube did have Eternal Darkness going for it, but Wii also had Wiiware games.

Speaking as a hardcore gamer, the Wii absolutely catered to my needs.

Games like Xenoblade Chronicles, Monster Hunter Tri, Metroid Prime 3, Sin & Punishment 2, Mario Galaxy 1 & 2, Twilight Princess, Skyward Sword, Donkey Kong Country Returns and many more kept me more satisfied than any Nintendo console since the SNES.