He was the only character in the New 52 Justice League line-up not to have his own series. Even Aquaman had two.
There were rumours at the time that these were due to character contract comlpications that also doomed an announced Raven series, but these were dismissed.
Now that the New 52 is no more, Cyborg is getting his own series from David Walker and the Justice League/Aquaman team of Ivan Reis and Joe Prado.
Should be quite a serious take…