"Worth it" is relative.
  • It is fairly easy and will mean you don't need new gear until around level 55/56, so you should be able to breeze through the first several Heavensward dungeons.
  • If you grind out levels quickly though, you may spend less time with the ironworks equipment than you spent getting it.
  • Finishing those quests before Heavensward (specifically Chrysalis and Steps Of Faith) is definitely easier with the ironworks gear.

Overall I'd say for your first class at least get the weapon and some of the major armor pieces. It will make finishing ARR easier and mean you don't have to worry about gear drops for a while.
With 3.2 they are throwing out soldiery completely, so I'd expect poetics to just be getting thrown at you.