I was running Crucible the other day with some friends and I was using my Hunter Gunslinger. Using the throwing knife, the speed, and the agility was so much fun! It's a nice change of pace from my Titan. Although I suck with Golden Gun and got most skills with gunplay.
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I main a Bladedancer and finally hit rank 5 in IB yesterday - it was a hell of a slog, too. Then I switched to my warlock. Holy hell. Positive just about every match, with a personal best kdr of 4.4 in one game. (Which, trust me, I could never get as a bladedancer, my best kdr in crucible was a 3.0 once.) I'm surprised not more people use warlocks in IB - they're tricky but kind of beastly.