I'm going with Nintendo. Even though Wii U sales may be bad, and the game QUANTITY is low, the game quality remains extremely fresh. I mean a Zelda remake and Pikmin got higher ratings on metacritic then games liek Titanfall or inFAMOUS: Second Son. Wii U also has been out a year longer, but there aren't any games that look too promising coming out only for PS4 or XBOX One. That is an early call though with E3 less than 2 weeks away.

As of right now, (and maybe 2014 in general) I say Nintendo without a doubt

The Wii U has a highest quantity of exclusives out so the quantity isn't low at all.

Well basically everything worth playing on the Wii U right now is an exclusive first party title lol. I'll just throw my vote to Wii U to make Nintendo a little happier.

Though in the rest of the coming year going into spring of next year, I expect my vote to shift xD

Wii U > PS4/X1 combined

WiiU right now. But the thing with PS4 and XboxOne is that they don't need too relay on exclusives as much as Nintendo.

Wii U. No doubts.
That's why there are no so many 3rd party games. Everyone enjoys the 1st party exclusives^^

As of right now you'd have to say wii U.

Seems like an unfair question considering Wii U's one year head-start and the competition's complete lack of Nintendo titles.

Nintendo has a years head start. If we count the Wii U's launch they are about equal. Sony and Nintendos first party takes time to grow. Microsoft has the advantage at launch in my eyes because the replace the development with the wallet, so they can fill in the gaps wherever they might be.