S3E1 was great.
The kind of flimsy terrorist attack thing that some people complained about was nothing more than an efficient plot device to get Sherlock back to London, back in everyone's lives again, and reconciled with Watson. I think it's perfectly obvious that the whole point of this episode was character building. Just as it should have been. This episode was right to focus on the characters because that's true to the core of the show: not crime solving, but the relationships. From the beginning, the characters have come first.
All of the cheeky nods to fans were very well done. Sherlock's fanbase has become part of its identity. A lack of meta commentary would have seemed inappropriate somehow, given the show's knowing modern tone and its creators' and cast's connection with the fans. The internet has made television more interactive than ever before. Fans aren't passive viewers but deeply and directly engaged participants in a social experience. It's become commonplace for popular TV series to acknowledge and sometimes troll their fandoms. As far as I'm concerned, this is one of the most enjoyable aspects of following a show.
Sherlock is back, and I'm so glad to see it has its priorities straight.