My thoughts exactly.
It should be immensely powerful, but perhaps have a longer delay on the amount of time it takes to recharge.
Personally I think it should use a considerable amount of MFC's rather than time to reload. You can always wait, it's more of an obstacle than a means of control. But if the gun used, say, 100 microfusion cells you could fire it several times but at the expense of all your MFCs.
Makes no sense of course but what does.