I liked it. Lars Mikkelsen/Charles Augustus Magnussen made the episode for me. The Mikkelsen brothers are a good bunch. Magnussen was brilliant, creepy, disgusting and I loved it. Although I think it was a misfire on his part to reveal the truth about Appledore.
My theory was that Sherlock and Moriarty are just as smart as each other and that if Sherlock survived then Moriarty had to as well. I knew he was still alive in some form, deep down honestly. However, I didn't know that he had a twin brother though, that is fascinating.