3. Shinsuke Nakamura

You can't find much wrong with Shinsuke Nakamura. A great performer in the ring. Charisma oozing out of the guy outside the ring. Eccentric and different when on the mic. And the best part, he's loved like crazy by the fans.
What more do you want from a WWE performer? Not much actually. But still we find Nakamura holding onto the US championship and despite that, he has no meaningful feud lined up.
It's almost forgotten that Nakamura is the US champion and something can be done with him. Nakamura in his own right was a huge star even before he stepped into WWE and it's shocking that the WWE can't figure out what to do with him. There have been so many rumors regarding him leaving WWE for NJPW. It won't be too big a surprise if he does. considering the treatment he's been receiving recently.