Why is it hard to believe that third parties are biased against Nintendo?

[Nintentacle]

HipHopGodd said:
It's no biggie really. I've heard for many years now that Nintendo's 1st party games are what sells their consoles. That's proving to be absolutely true.

Wii U's sales say otherwise. 

OP: Yeah, I'd say some companies like EA have a bias against Nintendo.