Proven genius
I'm sure that Einstein himself would insist on his work still being called a theory, not a law, for all the reasons so clearly and concisely outlined above. That said, I wonder how many other theories have had so many data collected which all say if not, "he was right", then very loudly say "he was not wrong". Given the difference between what is known now and what was known when he formulated his theories, the fact that "proves Relativity" type headlines (however imprecise/inaccurate) continue to be written is an impressive legacy and a testament to his genius.
Biting the hand that feeds IT
