Sure, HiB could sound more menacing. And I'd prefer gut to use a wrist-vibro animation like the ones in Republic Commando (which is what the icon looks like!). As for the use of storm to air-walk-pounce, it -does- look silly. An easy fix for that would be a reverse harpoon. Instead of harpooning and dragging someone to you, storm fires a harpoon cable that then pulls you to them.
They probably didn't want to do that to give both moves a unique look, but I have no problem seeing the cable move used both ways. Clearly it's a part of our general-issue equipment, we might as well make use of it.
Biggest problem is of course the heat/ammo discrepancy as noted above.