I have to admit, in all my warzoning no one I had played never against an opponent with a squad of Assault Marines (perhaps because the figs were hard to find).
Last night a friend used a squad of AM's from my stash and, Yowza!, They were bad-ase.
Those M74's with LR, even with a penalty of -3, an RC of 11, meant they hit on 8 or less. Add the HMG and sit tight using last actions as WAITs (as my opponent did) - it was brutal (also my opponent was rolling like a son-of-a-blight commando). I was getting picked off as I was dodging between scenery bits (like my squad of innocent young mirror men cut down in their prime...and all just because they wanted to show their lovely new Capitol friends ther shiny heatswords up close.)
The only thing that let me break through the fireline was a very well (aka lucky) rolled para-deploy of Shock Marines who got in close enough to toss a screen of smoked grenades. Still, before all was said and done, the AM's had done more than their share of mayhem.
D