#1 The Ascension
The Ascension were NXT's top tag team from 2013-2014. They held the NXT Tag Team Championships for almost a full calendar year and laid waste to just about everybody in their path. They were repeatedly likened to legendary tag teams such as The Road Warriors and were poised to carry that reputation with them to the main roster at the tail end of 2014.
They were ruined almost immediately upon arrival.
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Even though they won their first few matches, all the commentators would bury them throughout, calling them "cheap knock-offs" of legendary tag teams. Three weeks after their debut, they were publicly humiliated and laid out by the likes of the A.P.A. and The New Age Outlaws. While they defeated the Outlaws at that year's Royal Rumble PPV, their reputation was irreparably damaged.
From there, you could probably count on one hand the number of wins they've accrued. I honestly don't recall the last time I saw them win a televised match. And it's a shame because they absolutely could have been a mainstay in the tag team division. But obviously, WWE officials thought otherwise.
Without a doubt, The Ascension's call-up from NXT failed far worse than anyone else's.