I think if the solar flare was 5 times bigger then it would actually see some use over gally, truth, and the hunger. It isn't too much when the solar flare is only the size of a warlocks solar grenade.
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Or if the solar flare had a singularity that pulled enemies into its center that would be awesome. Statistically the weapon does more damage than gjallarhorn, but the enemies are programmed to move away from the solar flare.