It's not worth an exotic slot. I can just throw an AOE nade and use an ice breaker or bad juju. 95% of enemies will just move away from the solar flare making it useless, enemies that do stay still often have so much health that the solar flare effect is negligible and the flare doesn't make up for the lack of tracking. It's not worth being exotic because even the hunger is better and you can use a different exotic