I just feel there has not be anything special done with it.
That's a perfectly valid opinion to have, but how would you define 'special' i.e. what should typically be expected from the GamePad in relation to the value it adds to the platform?.
The off-tv play alone is worth it for me. ZombiU, Pikmin 3, Wind Waker and Nintendo Land all make fantastic use of the GamePad, I felt it made elements of these games feel like a distinctly unique (but not groundbreaking) experience. I really like it for displaying maps in some games, and some other games made good use of it (e.g. Black Ops II multiplayer, Deus Ex). There are only so many possibilities though so we can't expect every game to use it as standard for gameplay, and should we expect that?.
I don't feel the GamePad was ever meant to be the ultimate defining feature of the Wii U, but just meant to assist in defining it as a unique product by offering some unique experiences - which I think it succeeds in doing. It all comes back to the quality of the games in the end though, no matter the platform features. I don't think it's safe to assume that Nintendo's next home console will feature a new GamePad.
I am not sure if it is feasible or not, but with a lack of third party developers Nintendo should be looking to increase their own team and make use of more existing IP's or maybe come up with new ones.
I don't feel any single company develops, publishes and innovates more than Nintendo in the industry - and while supporting home and handheld platforms at the same time too. They are always working towards expanding their internal teams - in fact, I believe there was a new team created within the EAD division recently. Nintendo have been doing great work with their subsidiaries and partners in recent years too - e.g. Retro, Monolith, Creatures Inc, Namco, Atlus, Grezzo, and Platinum Games to name a few.
Third parties are always a tricky subject - it's difficult for third parties to compete with Nintendo on their own platform. Because Nintendo consoles are built for Nintendo games by Nintendo, the platform is not like or in-line with 'the other two', making ports more difficult. Nintendo themselves were largely responsible for the Wii's success - it didn't have the big 3rd party games that the PS360 had.
That said, more third party support is always a good thing and we would ofcourse see more of it on Wii U if the platform was more successful at market. I purchase Nintendo consoles to play Nintendo games though, 3rd party titles have always been the bonus.
At risk of coming across as too bias (I really am just honest with my opinions and tastes!) I will point out that:
- In some cases, the GamePad is used is gimmicky ways or in ways that put unnecessary boundaries on the UX
- Nintendo failed in their marketing vision and marketing execution with the Wii U - placing too much faith on the Wii brand and the 'device with a screen' trends
tl;dr - The GamePad is cool, overall quality of the games is what matters in the end. Nintendo do their own thing and that's mostly a good thing, even if it results in a product not becoming a significant success at market (i.e. they take risks).