A lot of fun, and mostly very well done. The movie manages to remain reasonably true to Conan Doyle's tales, borrowing from several of his best stories, while adding enough action and CGI for the younger set to stay interested. Wonderful banter and wit between Law and Downey.
Sperficial representation of Holmes' drug useage and seclusion when inactive, perhap because it parallels Downey's real life dramas, Holmes opiated seclusions are portrayed in an easily exited manner, with Downey emerging bright eyed and bushy tailed. CGI is awesome in the earlier parts of movie, but falls short at the climax, which in itself is unoriginal, and the set looks like a cheaply produced version of the rest of the movie. Budget Overuns???