#4 EC3

EC3 was one of the guys who was called up to the main roster earlier this year. And honestly, he has been wasted so badly that it's easy to forget that he is even signed to the company. He was a top guy in TNA, but somehow WWE has not acknowledged the amount of talent that this guy possesses.
Currently, EC3 is one of the superstars with no direction whatsoever and one has to wonder why was he called up to the main roster so soon rather than spending some more time in NXT? Vince surely doesn't see him as a World Champion, and his current booking is a clear proof of that.
R-Truth wanted to 'kill' former WWE writer. More details HERE
#3 Mojo Rawley

So from the last few weeks, WWE has been airing backstage promos from Mojo Rawley, which seemingly hinted at a character change for him with him becoming a vicious heel.
Last week, he debuted a new look on the Main Event episode where he faced Heath Slater and defeated him quickly. The fact that he debuted on an episode of Main Event rather than on RAW clearly shows us that the creative doesn't really care much about him.
His biggest achievement so far in his WWE career is winning the Andre the Giant Memorial Battle Royal at WrestleMania 33, but ever since he was had no clear direction. I won't be surprised if he joins the list of superstars asking for their release from the company soon.