I don't know, it seems like the rules for explosives ain't so bad and they're pretty deadly. Just take the worst explosives out there, commercial explosives which are rating 3. Let's say I attach them to a concrete wall. Armor 16/ Structure 13. Say I prepare the explosive well and get 4 hits on my demolitions test, that's effective rating of 7. Now say i use only 2 kilograms. That's a DV 10. Now against a barrier you double the DV of an explosive. So that's 20 DV. Now the barrier rolls Armor since it's an explosive attached to it so that's 16 dice. Even if it gets 7 hits, it still gets a 1mx1m hole blown in it. Now since it destroyed the barrier, the blast value is halved with the debris, meaning that if it dropped off by -1/m, it now drops off by -1/2m. That would lead to some pretty fucked up chunky salsa. If it's placed on the outside wall of a room that's 4mx4m, then a guy standing in the middle of the room would have to soak 9+7+5+3+1 DV = 25 DV. That's only 2 kilos of well placed shitty shitty explosive. Imagine what you could do with just a little bit of C4! Of course if you don't know how to set the explosive well you're gonna have a lot less effective blast which makes demolitions a damn good skill to have.
Now the rules for grenades/rockets/missiles is a problem area for SR. Scatter is just too large I feel and explosions drop off too fast to make them all that deadly. A street sam with a ruger super warhawk with APDS is a lot more deadly......which may be realistic, I'm not an expert....ask Teyl, he's the resident expert when it comes to things that go boom.
They also shouldn't call it "Scatter" or at least should clarify that scatter doesn't always mean "bouncing"...cuz a missle isn't going to "bounce"....it's just gonna "deviate" from the intended trajectory.....but SR just calls that "Scatter."