There is only one Sony published title in that list. So the simple answer is 3rd party support.

Nintendo's unwillingness to expand 1st party studios.
Their own quality standards which make them constantly delay games to make em better.
Lack of major 3rd party support. (Though 3DS has PLENTY now, man gotta be loving that.)

Nintendo handhelds have historically been fine. Nintendo consoles on the other hand....yeah. Lots of software droughts.

What they SHOULD do is create a massive back catalog of VC games and the like to keep everyone happy. Classic Nintendo could last someone for a good 2 years. What they WILL do is drip-feed.

Nintendo develops/publishes FAR more titles than Sony and MS

But 3rd party support is beyond their direct control.

yeh.. no third party support.. what do u expect...

^ this, 

Nintendo is not that big a company, yet they have to support two platforms. Their small size is only highlighted by a lack of third party support. If they only needed to support a single platform, their average of about 20 games a year would be plenty.

Nintendo is just one company who like all others can't release games 24/7. They have to be made first afterall.

Nintendo released more games for the Wii than they had any home console since the NES.

The reason there is a drought is that they put too much developmental focus on 3DS. Games like Luigi's Mansion 2 and Paper Mario: Sticker Star should have come out on Wii U. That is all.

To be fair, Nintendo actually is a pretty huge company. If by "not that big" you mean they aren't the mega-conglomerate that Sony and MS are, you'd be right. But Sony and MS' games divisions are relatively small compared to the decades-old operation Nintendo has going on. The "Big N" actually has far more development teams under it's umbrella than Sony and MS do combined, but as you say, they have to provide not only retail content for Wii U and 3DS, but also digital eShop content for those platforms as well.

Wii U will be getting PLENTY of games.  So this mundane rehash of a thread topic really needs to go away. E3 will be here soon enough, and then people can finally shut up.

too bad Nintendo can magically complete and release the games

use magic Nintendo, God dammit!!