Well, that sums up pretty well what's wrong with your arguments.

The amount of ignorance in the OP is too damn high!

Can people please stop comparing these systems.  In particular, I'm tired of the statement that Gamecube had lots of awesome games and didn't sell well, so how are games going to help WiiU.  The systems are nothing alike.

People say Mario Sunshine, Zelda: Windwaker, Smash Brothers, Luigi's Mansion, Pikmin, Metroid Prime and MarioKart DD couldn't sell Gamecube and they were amazing games.  I'm sorry, but they aren't.  Well, they may be great games, but I wouldn't know, because I didn't play them and didn't want to. I bought a PS2 instead.  And an XBox.  Mario Sunshine was a dorky name for a game with Mario using a watergun on vacation.  Zelda was a cartoon.  Metroid Prime may be amazing, but to me it looked weak and boring compared to Halo.

Now, when I saw Super Mario Galaxy, Zelda: TP and Wii Sports, I was sold on a Wii in an instant.  The realistic, epic-looking Zelda and the mind-blowing Mario Galaxy were spectacular.  Throw in New Super Mario Bros Wii for good measure and you have some serious 1st party titles that appeal to me and a lot of other people.

When it comes to Wii U, we haven't seen the major titles yet.  I would have every reason to believe that Nintendo has learned what sells and what does not, and Wii U will be receiving Wii-like titles that are system sellers.  The Mario will follow that path of Galaxy and be impressive visually and have an appealing theme.  Mario won't likely be going on vacation again, ever, especially with WiiU sales struggling.  Zelda will likely be a back-to-basics graphical showcase that sucks in core gamers.  No waterguns.  No toons.  As such, the games will likely appeal to a broad audience - the Wii audience - and move systems.

Also, the Gamecube was a purple lunchbox with a legoland controller.  I know some of you may have loved it, but most adults and many teens wouldn't touch it, rightly or wrongly.  No amount of good games could sell it.  Wii U is sleek, black (or white) and contemporary looking.  Give it games and people will be happy to have it in their living room.

The sales are currently weak, that's for sure.  But the point is, the games that Nintendo released for Gamecube were not system sellers.  The games they released for Wii were systemd sellers. I would expect the games for Wii U to be more like their Wii counterparts when they come.  And other than sluggish sales, there is almost nothing similar between Wii U and Gamecube, in look, design, function or games.  Their plights are very different.

How so?  I'm saying whether or not the GC games were good, I didn't want to play them because their theme sucked and the system looked like a purple candy box.  People say GC didn't sell in spite of great games, I'm saying it didn't sell because it was purple and BECAUSE of games that may have been good but had sucky themes and/or styles.  It's like Infamous.  People say it's great and wonder why people don't buy it more.  I can say that myself, and the masses, are not interested in it's theme of some generic superhero that shoots lighning and chooses between good and bad.  Mario on vacation cleaning stuff? pass.  Mario flying through space jumping from planet to planet bending gravity? Sold!

You're blaming marketing then.

actually there is, its the target audince that nintendo wants, the market they want to sell to, which is the core audince. the adult males who been playing video games for decades. and there comes a problem with one of your points. mario galaxy1 and 2, Wii sports and the games you listed were system sellers, but to who? the "casual" crowd, the new market the Wii sold to, not the market of gamers who bought the xbox and ps2. the question is, are those games going to be system sellers to the adult gamers or "core" gamers? 

Absolutely not.  I'm blaming the games and the sytems themselves.  The games were poorly thoughtout.  They may play well, but a major component to any game is the theme and art style.  In the gamecube era Nintendo made terrible decisions.  Mario with a watergun was a very bad decisision. Calling the game susnshine was a bad decision.  Making Zelda a cartoon was a bad decisison.  No amount of advertising could make these games seem cool.  The games were flawed in their very themes.  If you took God of War and took away the greek theme, made it cell-shaded, and had Kratos running on the beach cleaning buildings, God of War: Jamaica would not sell well and definitely wouldn't move systems.  And if you put said game on a purple box with a handle it wouldn't sell systems, no matter how good it was.

"Wii U is sleek, black (or white) and contemporary looking.  Give it games and people will be happy to have it in their living room."

the problem is that a lot of people already think they do, they just think the WiiU is an accessory