To be fair, the brits express alot of the same sentiment. I would agree that the average British show > the average American. However, there is no British "The Wire", Sopranaos, 6 Feet under etc. Americans spend alot more on production, and their Drama tends to be much better.
Out of my favourite shows, 15/20 are british, but from the top 5, 3 are American.
The show has sparked a new interest in Holmes, and the books are picking up sales again. As well, the coat Sherlock wears has become rather sought after.