Any vets out there think starting a 1st character ranged is a good idea, or should I go melee, or defense + melee?
Well...I know that bowguns have been redone in MH3, so this might not be terribly applicable, but:
I had a friend who went ranged-only on his third restart (lost his data twice..). Back in MH1 there were two classes of bowgun: light and heavy. Light ones had low attack power but higher mobility and more ammo versitility, and heavy ones had the opposite.
Light bowguns turned out to be not really feasible for soloing. They're great for support, but just didn't have the damage output to reliably kill things within the time limit (50 mins).
Heavy packed a lot more punch, but you lost the ability to move faster than a slow walk while the weapon was drawn, and it had a longer draw/sheathe time than the light ones. Also lost the ability to use poison/stun/etc. ammo.
My understanding is that MH3 makes bowguns more customizable, and adds a "medium" class in between heavy and light. I don't know anything about it.
I guess I'd recommend trying it out with your first character and then sticking with it if you like it. Switching between melee and ranged requires you to completely relearn the controls and change your strategy. A good gunner can be
very good, and a big asset to multiplayer, but it requires a lot more thinking than melee does, both in combat and inventory management.