Went to see it earlier today, a great movie.
(Spoiler)
I loved the usage of surround sound when Holmes and Watson were looking around in the Warehouse at the river, hearing Lord Blackwood's voice come from behind the audience so clearly was just so immersive.
Everything was cleverly executed, I never felt like I was watching a Scooby Doo episode where it was so predictable, I would have never guessed half the stuff that happened was not actually "magic".
(End spoilers)
I already suspected it, being already familiar with Holmes. It's not uncommon for seemingly supernatural events to be shown later to not be supernatural at all in a Holmes story. That element was lifted and used in Scooby Doo, as well. So I had an idea of how a few of the "magic" things worked.