Actually, I've heard that comment before. I think I first saw it in the book The Elegant Universe - Superstrings, Hidden Dimensions and the Quest for the Ultimate Theory by Brian Greene. We have to remember that Eistein created his theory without much of the modern equipment (such as speedy computers) to do it with. It is a theory rather than a law. Which means that it is subject to time and creation. As new theories come forward, previous theories may be altered with it.

For those interestined, I've heard that the book - e=mc2: A biography of the most famous equation - is quite good.