I can't review this episode, really. I mean I'm not going to sit down and write out the plot. The plot can be said in a few measly sentences: Sherlock comes back from the dead, John is confused and angry, and a terrorist threat sends Sherlock and John to an underground train car where Sherlock flips the off switch on a giant bomb. Meanwhile, we get a lot of different stories as to how Sherlock might have faked his death, and no real straight answer.
Let's start by talking about that second thing. All of the theories about Sherlock's survival were amazing. The way they pulled that off - God, it was brilliant. More than anything I've seen on television in a long while, this episode felt like a love letter to the fans. I mean, they worked in everything. The body double, the biker that hit John, the ball under the arm, Molly knowing the truth, the placement of John so he couldn't see what was going on, the idea that Moriarty's body replaced Sherlock's... these were all theories I've seen floating around for the past two years, and here we have them all coming to light on screen in front of us. Rather than being disappointed by the lack of definite answers, I was delighted by the way they did it. It was pretty much the only way to leave nobody disappointed by a lame solution. I do hope we'll find out the truth eventually, but I've actually realized that it's not needed. Like John said, I'm more interested in why Sherlock never told John he was planning all of this, or why he didn't come forward sooner, at the very least. Those are the questions I'd love answers to in the future.
As for the main plot, it was probably the weakest part of the episode. Not in a bad way, oddly. I think it was a very smart move to let the case be a rather simple one. The characters were what was important here. We got to focus on all the crazy theories about Sherlock, and we got to focus on all of these character's reactions and relationships. It was smart of them to throw Moran's name into the mix, even if his role was greatly diminished from that which he has in ACD's original stories. I think by far the most intriguing part of the plot was the kidnapping John thing. Who was that? And at the end, we see the guy watching the video of it? Wow, that's interesting. So much more interesting than a vague plot about terrorism and parliament, which was so phoned in that they didn't even bother putting in any twists. Sherlock and John show up, Sherlock stops the bomb, the end. But like I said, I don't mean that in a bad way.
What I've decided to do with this review is break it down by character and just talk about all of the awesome going on here. I mean, literally every named character on screen was pulling some pretty heavy weight and doing some fantastic stuff. Let's start with...