Okay, so let me start this discussion with telling you that it is my opinion that the current rules for Skaven Ratling Guns make the unit not entirely worth its pointcost. And since I am already looking forward to the new Army book somewhere next year, what do you think of the CURRENT rules for the Ratling Gun, and what changes would you see happen to balance it, or even improve it?
To start off:
The current basic rules state that only mansized model with Skirmish rule benefit from the -1 to hit when shot at. But, since the Ratling Gun stands on a cavalry base, this does not apply to the team, so they are MUCH easier to be shot. This in combination with the loss of the targeting rules from 6th edition, makes them hardly usable against shooty armies.