And yes, agreed, pushing rolls is very important to success in general, and the main advantage PCs have over NPCs. You can still push a roll even if you're already showing multiple mishaps, though! I had one player do it in a do-or-die situation and it worked out for him. Jammed, almost broken weapon was a far better alternative than the faceful of bullets he seemed all but guaranteed to receive otherwise.
I do agree that in most circumstances, around 3 seems to be the sweet spot for ROF, except those rare instances where there's a stack of enemies bunched together or you just absolutely need to hose a MF'er right now. Otherwise you end up mostly using a lot more ammo and facing a lot more jams for not huge gain. Every now and then, though, you end up with critical hits against multiple enemies in a single shot. That's pretty ninja.
But, again, all this kinda gets to flaws in the presentation of MGs as I see it. It's not that they can't be effective. It's more that they mostly don't seem to bring a lot of their real-world advantages. IRL the MG is the most important part of the squad. In 4E (which I generally think produces slightly abstract but overall very plausible combat results!) it's a second-rate tool, unless you happen to have lots and lots and lots of ammo.
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