Let's not forget one of the things that really sells the original Robocop suit--the robotic body mechanics that Peter Weller and mime coach Moni Yakim developed. If Weller walked and moved as he does normally, it wouldn't have been nearly as memorable.
Yup, i always loved the way he swung his body around, then the head would follow, a really great series of movements that brought the character to life in such a cool way.
lee