Wow, I gotta say.... my arena defense/offense has never had a higher win rate for both until I got Van Helsing. I use him for everything. His ability to cleanse perma & perf. death, doom and stun, plus put marks on Labyrinths, he hits like a tank, hits single and multi enemies, no damage for 2 rounds for the whole team, revives allies after an action, can wear Labyrinths, heals allies, and best of all.... he's a Vampire killer. I like when he rings opponents bell (Ding!) He can go up against Ferryman, Gambler, LoL, Lucifer, Raven Witch, etc.
It took awhile to really appreciate him, but he works synergistically w/ W. LoL , Charlotte & Malakhov.
As far as Bounty Hunter, I'm not sure he's worth it. But like Yup said, get the Cyborg awakening shards and a Cosmic first. I have Cyborg Eddie, so maxing him w/ a T3 is probably better than just getting BHE. I don't think I could have enough ironite to get BHE and the cosmic or shards. I agree that he is probably more a collectible. Which I stopped doing when I couldn't get Guy Fawkes Ed.
This is from the madness level, looks like just Cyborg w/ a passive.