Looking at the Wii, I'd say these are the results of bad 3rd party support.
If you're going to buy a Wii, you normally don't do it for 3rd party games, you do it for Nintendo games.
This has nothing to do with Nintendo games being automatically superior to all games from all publishers on all consoles, but certainly true if we only look at the Wii.
With Nintendo games, you always get what you expect.

Without a doubt. For me, Nintendo games render getting a console from a different company pointless.

I could make a very good list of many many games that are better than other nintendo games yet get nowhere near the sales they deserve.
The point I'm getting at, is that for you guys Nintendo games are the most fun. Figuring out why you think that will give you the answer because there are many games that are better. My question earlier was rhetorical. It's like, "do you really think the best soft drink is coke", "do you really think the best store is walmart".. The answer is always no. There are equal or better things out there that are simply overlooked.

hey i mentioned this months and months ago about the state of other developers apart from nintendo and got flamed by the 360 and PS3 fanboys lol has there been any other developer apart from nintendo have a 20 million + seller in a single game other than nintendo?

Saying there are any games that are actually better is just opinion. Same as me saying there are no better games. This is how I think- Nintendo games are the funnest games ever made, but Other companies do make some pretty good ones too.

Yes.

Why can't Nintendo have better creative talent than anyone else? You claim that if Nintendo never existed that Mario would still be around with minor tweaks, but if that was the case how come no other company has come close to creating that 2D Mario Platforming? LBP sucks in comparison to Mario for 2D platforming and it is Mario's closest competition this generation being 10m back. The level editor is great, but LBP lacks the challenge with not enough badguys (and the stupid buttons to kill them) and floaty physics. If it was all marketing and business strategy, then Sony must be horrible at those things, despite Sony being a very successful company that has convinced consumers that their overpriced electronics are better than the competition.

all those big games aren't going to end up at 20-30m because Nintendo knows how to advertise. It is because they know how to make the games that people love.

Yes I do.

I think it's Nintendo's willingness to step back every once in a while and say "Cool, but will it/can it be any fun?" and if the answer is no, then they drop it. Focus on gameplay and fun factor vs epicness is a win. Whether I like it better or not doesn't matter in the context of the question.

How much NSMBW would've sold if it was the exact same game, gameplay-wise, but with different characters, brand, yet still on the Wii?

You falsely assume that Mario = Sales, but that isn't the case. If it was, every Mario game would be at 20m, but there are plenty which aren't. Heck, only a few months ago people were claiming that NSMBWii wouldn't even break 11m within the first calandar year. Also, Sticking Mario into a Metroid game wouldn't make sales rise, and in fact most people would probably say forget about it. I'm sure Nintendo does get a fair number of sales by the people who buy everything they produce, but the same can be said about any good company. Advertising has an affect on sales, I won't deny that. But a great game with good advertising will sell. A bad game with great advertising won't. A great game with poor advertising will flounder, and a bad game with bad advertising just flat out won't sell. You can advertise & paint a turd all you want, but in the end it is still a turd. Nintendo did not produce turds to sell 13m units and counting.