What kinda Ranger should I be...

...from Arborstone till the end of the factions campaign...?

You never really have to stick with just one build, but just don't try going as a trapper in Arborstone, especially with all the kd. Interupt works well there.

any, every, and all builds that you want to play.

Anything you want, although sadly the most effective (specially with henchman) is Barrage w/ 16 Marks 13 Exp, some interrupts and the trusty Throw Dirt to stop Oni utterly raping henchman.

Dazing bosses and other annoying casters makes life alot easier. Kuunavang is near impossible for one interrupter to handle without the daze condition. So broad headed arrow and interupts or concussion shot and other interrupts makes for a great interrupt build.

I would agree that interupts are a very effective ability to have in most ranger builds, but I still don't see a whole lot of potential in Broad Head Arrow, at least in PvE. I say this because most enemies go down before they will have more than one or two spells interupted by Dazed. If you are boss farming, then yes, this can be used very effectively, but for the most part in general PvE play, I see limited use for this skill.