Yeah, they're everywhere. But 4-5 seconds of an open area, instead of just 1-2 seconds, can make a world of difference. But that's just one example. Hell, think Crucible, even. Pop one guy coming through a doorway, and nobody else will come through after because of the Solar field left behind. Time for you to reload, recover your shields/health. Time you wouldn't have had if you used Ghorn, and they were far enough back to avoid the mini-bombs. Now, this doesn't mean DB is overall better than Ghorn. It's not. Neither is really "better" to be fair. They're both great guns, but DB gets shoved underneath because the raw damage doesn't match Ghorn.