The technology is almost entirely perfectly designed. Some of the costumes are a bit odd but PT fails in two departments design wise.

Creatures, they look too cartoonish and being rendered as CGI does make the the world seem less physically real than even the plastic fantastic of ROTJ.
It doesn’t show the old used world of the OT as new and early new aging. We should have seen the precursors to R2 and Threepio as used and beat up and Artoo and Threepio as brand new. The X-Wings, Y-Wings etc should sparkle with gleaming panels and be the cutting edge of their day to be passed down and be the stripped down rusty hotrods of tomorrow. Padme’s world defended by gleaming chrome plated Y-wings would have sold the transition better. As for Vader’s first mask forget it. Also those spindly looking battle-droids look too sophisticated to be mass produced before Threepio. They should have been chunky IG-88 types so when we see one in ESB being used by bounty hunters we get a sense of them being the past that would be replaced.