I've been playing the bountry hunter for a while and as far as PvP goes your going to run into a lot of inconsistent feed back For every person who says the merc sucks in PvP someone else is gonna say there awesome. if you wanna roll a merc for dps its either gonna be the arsenal or pyro. pyros faster then the arsenal since they don't need to spam as many activation heavy abilities, but don't do as much damage. as for the Arsenal, you'd better like the idea of having your feet glued to one spot and being stuck there if you wanna do any damage, because you'll be slower then a sand crawler that keeps getting stuck in neutral. You'll have to stand in one spot and spam tracer missle (1.5 sec activation each) to stack the armor reducation then try to unload on the person, you can be easily countered by interrupts, or your target casually walking behind anythign to break your line of sight, your either going to get it right and steam roll a few guys or be a walking free kill