Luna's Howl is the highest damage 140 in the game with Mag Howl activated, even compared to exotics. Outside of bows and Fighting Lion it's the highest damage primary ammo weapon in the game. The problem you are likely running into is that it's also has the highest skill ceiling. Players with strong movement skills can capitalize on Slideshot, and hitting shots is of course what makes the gun great. I suspect that you attitude about the gun in PVP has more to do with your 50% DNF rate in Crucible than the actual performance of the gun. Maybe I'm projecting, but that amount of DNFs suggests that you get pretty salty in PVP, which would absolutely color your view of the guns you are using (unless you have a major ISP issue). In PVE Healclip + Incandescent is absolutely S-tier, especially if you are on a Solar subclass. Healclip is a great sustain perk, and combining it with Ember of Benevolence for 400% ability regen is absolutely goated as a support ability. It doesn't have the add clear ability of Sunshot, and does less overall damage than Zaouli's Bane, but it is still one of the best PVE hand cannons in the game, let alone Solar hand cannons.