I liked the action sequences when Sherlock dissects the situation in his head and meticulously plans out every move before executing the plan in a sudden blitz of movement. The overall plot was a bit dense but I liked the twists that it took - some of them genuinely surprised me (at times there are too many - enough that I was confused).
The interactions between Downey, Law, and McAdams were fabulous. Each one performed wonderfully but I think the one-upsmanship between Downey and McAdams stole the show. Downey's Holmes was a bit too close to Tony Stark's quirky brilliant outsider for my liking.
1LR Review: 16 out of 20 - It's a Hit!