I gave up on it years ago, shortly into the Tennant era. I've watched the occasional episode since but it still strikes me as lacking and hollow. I dunno, maybe it's simply that it's not aimed at me (wrong age, wrong demographic, wrong who knows) but I simply don't see what others seem to.
I fear Sherlock has gone the same way; purports a cleverness that is marginal at best, absent at worst. I thought the 2nd or 3rd episode of season 1 was brilliant but nothing has come close since. It flatters to deceive, is the emperor's new clothes, etc.