my only gripe is, when would one NEED to be a gunslinger? he has semi automatic weapons (revolver, 9mm, handcannon, mk23, etc), but what about the situations when hes completely swarmed? hes not a sharpshooter, so he wouldnt be far back sniping, and hes not a commando or zerker so he wouldnt be up front protecting the sharp from lesser threats. it seems like a gunslinger would be either overwhelmed, or using other perks weapons (like a bullpup).
i dont see the point of the gunslinger, or its usefulness in the game. even sharpshooters dont solely rely on their 9mm or handcannon - they are always secondary to the M14/crossbow.
This has already been discussed.
Gunslinger is not a solo-able perk. Well, none of the perks are fully solo-able, but a Medic can go solo if he gets a crossbow and a katana, and so does the 'zerker. But I digress.
The gunslinger would represent an assistant, pretty much like the medic or support to some extent, but he'd provide full bellical assistance. Medic has "health care" and can take down lesser specimens with MP7. Support can weld doors and take short-range specimens down. Gunslinger can take down almost any kind of zed that would provide a threat to his "partner", though less effitiently than the perks meant to do so.
He can spray his 9mm and take down lower-level specimens (clots, crawlers, stalkers) but a Commando and a Firebug will outshine him. He can use his handcannons to take down mid-level zeds, but a support will do so better than him. He can take down stronger zeds at a distance, but a lot slower than a sharpshooter.
What the other perks lack, is this versatility. This power to adapt to what's in front of him. Surrounded by clots? Draw dual 9mm, and fire away. A group of bloats and sirens is approaching? Use your handcannons. FP coming, and the nearest SS is too far away? Use your revolver; aim carefully, and you may survive.
Though, he can't do this on his own. He has to be protecting someone, to cover his back, fill in the gaps between range and zed difficulty, so both get a better chance to survive.