Well start off with the basic question is it worth watching? Yes.
Is it any good? Well good enough.
It offers a great premise, I mean gangsters and Karachi together is a firey combination if filmmakers only use it properly. Shamoon tried his best here but the lack of budget is quite visible on screen. A show with such story deserve a bigger budget and a more detailed execution. 20min episodes didn't help that purpose either. Where there is not much good in this show you can just watch it for the sake of some performance like Shamoon and Hassam and the guy playing SSP and the guy playing the cop (the honest one).
It surely is worth a one time watch but if season 2 is in the making then producers please invest a little more money in it. A story like this deserves grandeur.