My vote for best-written episode yet, with layers of reflexivity both obvious and subtle. Doesn't tip into fan-service somehow - or maybe it did, and I don't care. The writers' struggle between gratifying the "how'd he do its" and the "let's move ons" is made manifest in clever ways. HOWEVER, ep is padded with s1 directorial bullshit: wacky graphics overlaid on Sherlock, shitty map scenes when people travel. Oh well.