2. Dolph Ziggler
Ziggler is one of the most underutilized talents on the current roster. The guy has been around for more than a ten years in the WWE and still has been confined to the realms of the mid-card.
Ziggler has become a sentinel of sorts, of the main roster. Any promising superstar who has to cross over from NXT to the main roster has to go through Ziggler these days.
Currently feuding with Baron Corbin, Dolph has helped rookies like Tyler Breeze and Big-E make a name for themselves at his expense. Not only in the ring, but Ziggler puts over people in promos as well. Moreover, his best trait is his wrestling style that gels well with any wrestler you pit him against, resulting in some solid matches.
Had it not been for Ziggler on the current roster, getting over would have been a laborious task for the NXT graduates taking their initial steps in the WWE.