The more I think on it, the more I'm convinced that there isn't really anything "wrong" with NXT aside from the usual nitpicking that we can do. Given the format of the show, the fact that it's only an hour long each week and the fact that it's ultimate goal is to build up talent to head to the main roster, I don't really think anybody can realistically ask for more.
There's all kinds of potential going on all over the place. In the women's division, there's Ember Moon, Peyton Royce, Billie Kay, Nikki Cross, Ruby Riot and Kairi Sane as the foundation at this point. The division will be bolstered with the likes of Abby Laith, Dakota Kai, Jazzy Gabert and Bianca Belair; plus, I think WWE would be well suited if they tried to sign Candice LeRae, Shayna Bazler and Toni Storm.
As for the tag team picture, you've got SAnitY, the Authors of Pain, Heavy Machinery, reDRagon, TM-61 (who returned to action recently during a dark match at either a very recent house show or the last batch of NXT tapings, a possible tag team consisting of Oney Lorcan & Danny Burch, the Street Profits are on the rise.
As far as the singles and main event pictures go, you've got Drew McIntyre, Roderick Strong, Johnny Gargano, Aleister Black, Andrade Cien Almas, the UK wrestlers like Pete Dunne, Tyler Bate, Wolfgang & a few others, the Velveteen Dream looks to be coming along slowly & steadily, Lars Sullivan has all the potential of the next great destroyer.
Personally, I think if the Cruiserweight Division was moved to NXT, thereby being placed directly under Triple H's control, it'd be icing on the cake.
"What Do I Know Of Cultured Ways, The Gilt, The Craft And The Lie?
I, Who Was Born In A Naked Land And Bred In The Open Sky.
The Subtle Tongue, The Sophist Guile, They Fail When The Broadswords Sing.
Rush In And Die Dogs - I Was A Man Before I Was King."
Conan Of Cimmeria