The Authority is the natural evolution from Watchmen. It's like if you took those characters but instead of having them be pathetic you made them hyper-competent rock stars. Consequently, instead of being like Ozymandias and secretly taking over the world, they just do it in front of everyone because no one can stop them.
It's strangely, in that very Warren Ellis way, simultaneously uber-cynical and idealistic.
So definitely read it.
Also it's super violent:
Also Batman and Superman are gay and a couple.