I don't think stormtrooper armor was supposed to be heavy powered armor or anything that crazy. They spend most of their time just grilling civilians or running checkpoints.
Everyone compares them to jin-roh but they're used in fairly short operations by specific forces. You're not supposed to just hang around all day in that stuff.
Besides, stormtroopers already look pretty neat. It's the rebels who need more work on their audience appeal.