It's just good. Solar Grenades, and dem 3 bullets.

Believe it or not, it's actually good for soloing the deathsinger on normal crota. Three shots per wizard, then pop a heavy synth and take out both shriekers and still have 5 rockets for the deathsinger (if you have a perk to carry extra heavy). Since she doesn't move the pyromancer perk wrecks her. Or you can use it for mob control.

The solar flare that is left behind after the explosion. It also has a massive blast radius and three shells per magazine. The velocity isn't too bad. I got mine from the Aksor strike and I love it