I will note, that I just solo'd a taken corruption on Mars (one I failed multiple times before with other ransoms before) in a few minutes simple because I sniped every lieutenant and then sniped the Zealot. Without that sniper rifle I still wouldn't be able to solo it. A shotgun or Fusion rifle just can't do the same time of damage, and if they could you can survive in that onslaught long enough.
If it's the best you have and need it for light level stick with it, but otherwise (at least while raiding/striking) you might want to adjust to what works.