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As someone that has been involved somewhat from an engineering side of "new armor" technology, the issue isn't really about the exoskeleton aspect(although it's not totally there yet either). The main issue for a "power armor" is the actual armor protection.

Our technology in ceramic matrix, and metal matrix composites is really starting to give us the ability to create a thin plate armor system that can withstand many different types of projectiles in the 50 Caliber range. When you start getting into RPG's and large caliber shells, we aren't there yet, without an ablative system.

Also there are issues with blunt force trauma even when the projectile is stopped by the armor plating.

Basically we don't have the technology to create an iron man type suit that is form fitting, like we see in the movies. It would have to be huge and bulky

Think "Hurt Locker" puffy suit.

GG