WWE does not have the best track record when it comes to its tag team division.
This will not come as a surprise to the bulk of its fanbase, but it bears repeating as, when they do put the effort in, they are actually really good at tag teams. The Hart Foundation, Demolition, The Hardyz, Edge & Christian, The Bar, The New Day, The Usos; in their own way, each of these teams revolutionised tag team wrestling in the West, but at the other end of the spectrum, there was some absolute trash.
Of course, not every tag team can be a raging success, in the same not every singles star can be a World Champion. Mid-tier tag teams have their place in the tag division, The Bashams, Money Inc., ShowMiz, et al. provide the losing fodder for tag teams on the ascent, or in service to a much bigger picture.
However, a step below them is what is presented to you today - a collection of seen-to-be-believed combinations who had an extended time together in which they accomplished practically nothing.
In many cases, not even a sniff at challenging for a Tag Team Title...
10. Rey Mysterio & Sin Cara
From Alberto Del Rio, to Sin Cara, to Kalisto, and now with more present attempts in Dragon Lee and Axiom, trying to 'Jinder Mahal' the Latin fanbase with a “new Rey Mysterio” has been an ongoing pursuit for the WWE for over a decade now. It's worthwhile - the 2005 Eddie Guerrero Vs. Rey Mysterio programme performed excellently in key markets - but Rey's magic is inimitable.
In the early 2010s, after it became increasingly obvious that Del Rio was more effective as an overbearing, entitled heel, WWE revived their attempts to get their machine back behind Sin Cara, who had just finished off his feud with his own Brian Harris: Sin Cara Negro, AKA Hunico.
Banding together to fend off the mask-hating Cody Rhodes, Mysterio and Cara paired up for about six months, starting from July 2012. They soon coordinated cute little half-and-half masks and entered a Tag Team Championship #1 Contender Tournament, losing to The Rhodes Scholars in the finals. The rest of their time together was spent feuding with The Prime Time Players and Team Hell No, before a slightly tumultuous 2013 for the pair saw Cara eventually leave WWE, ending the partnership for good.