I like Lang. A fascinating character (have you read Patrick McGilligan's eye-opening biography of Lang, John?) and a director who displayed flashes of absolute brilliance at times.
I don't think anything compares to his early German films - M, the Mabuse films, Metropolis of course - but several of his American movies achieve a very high standard, too.
A few of his noirs are among the finest of all - The Big Heat, his Edward G. Robinson vehicles - though a number of them are also quite plodding. The idea behind ...Reasonable Doubt is fine, but it contains too many ridiculous twists for its own good. From that late period, I prefer the similar While the City Sleeps.