First off, you're spot-on that Marksmanship is a better bet than Archery right now. I have no idea what color of paint the guy who created Apex Arrow was drinking, given how poorly it compares to most merit weaponskills.

Ranger is more of a niche use job now than just another job that exists to hit monsters in the crotch. It's a lot like Paladin in that regard, I guess. For example: Ranger doesn't have much of a place in the average pick-up group that just kills normal monsters for Plasm, but many groups include a few Rangers or a Ranger party when fighting Mastop or Muyingwa.

Your best bet is to level a job that just straight-up hits stuff in the crotch (WAR, DRK, MNK, etc.) in addition to Ranger if you really want your role in every battle to be hitting stuff in the crotch. That evil, evil crotch.