10 NXT stars who were brought up to the main roster before they were ready 

#7 The Ascension

Konnor and Viktor have had an uneventful few years on the main roster

The former NXT Tag Team Champions came to the main roster in a storyline that saw them trying to abuse legendary WWE tag teams. It probably wasn't the best way for them to be introduced to a new fan-base and it lead to the legends getting revenge on them just a few months later.

Since then, The Ascension have just been making up the numbers in main roster tag team matches, which is unfair to them because they have the potential to do so much more. Konnor and Viktor proved themselves in NXT and if they had remained on the developmental brand a little longer then they may never have been part of the storyline that essentially killed their career.