Fenixp: Well, the damage output of both Drednaught and outpust miniguns (aren't they assault canons or something?) wasn't all that great, and Dreadnaught was quite inaccurate to boot - while moving anyway, and he was always moving to get into meele with that pesky infantry :-P
They are indeed called
assault cannons in the 40k universe.
The listening post's assault cannon actually isn't too shabby: The Dreadnaughts' assault cannon is approximately as powerful against infantry as a space marine squad heavy bolter without any upgrades, however even with upgrades the heavy bolter is outclassed by the assault cannon when it comes to vehicle damage. The listening post II though is quite a bit more powerful than an upgraded heavy bolter in a SM squad (approx 20-30 extra dps against infantry), only it's a little less accurate. Or rather, the space marine squad is a bit more accurate (75% accuracy vs 65% accuracy). Both the heavy bolter and the assault cannon are pretty weak against vehicles though, although the latter not as much as the former.
From a
site I used to frequent a lot when I still played DoW :D
...and now I miss my DoW days :P