There are many things that Robin Williams can do well. But thoughtfully convey the mental and physical transformation of a robot who — thanks to technological advances — becomes virtually indistinguishable from a human being? Not so much, especially under the direction of Christopher ''Home Alone'' Columbus. Thankfully, the late Isaac Asimov can take solace in the fact that his original novella will, for at least another 200 years, remain unmolested by Patch Adams.—Youyoung Lee