Thorn's bounty is a literal thorn in the ass but it's probably one of the most fun exotics even before they buffed it to make it workable. Make the decision yourself based on what you have at your disposal for the void part(Atheon's Epilogue is the more easily accessible primary that can use void), but it's definitely something you won't regret if you actually get the gun. On a side note, though, you will likely get burned out on Crucible for a bit. It's a lot more rage-inducing when every death hinders you; really makes you realize how much bullshit you let slip by you as normal in Crucible on a regular basis.