Partninnja is on the money, scatt lasers staying at long range is what you want as Saim Hann.
The sheer volume of shots will take most infantry down, they also have enough volume to dent light tanks, typically they put in the finishing blow.
I don't see too many people playing Saim-Hann, mostly because the other factions get better buffs, but its also because most armies now can easily get things to where they need to be, with pin point deep striking or just straight out insane movement tricks, so keeping scat pack at range is not as easy as it once was.