Truly entertaining and beautiful to watch. The plot is basic, but that doesn't take away from the movie's wallup in the least. In fact, I'd like to thank Cameron for not complicating the movie with fourteen different subplots. Because of it's back-to-bones basics and amazing cinematography, the movie accomplished what so few do these days: pure entertainment once can watch again and again.
The whole idea of Holmes as a drunken, narcissistic genius is entirely new and one that can be so absolutely entertaining. And truly, it was. Downey was wonderful with the part he was given and was a pleasure to watch.
The problem, however, lies with the rest of the movie. His love interest is neither sexy nor mysterious, and the audience is expected to care about her because....I'm unsure of the reason. Not to mention the flimsy plot and lack of general character development.
Honestly, though, if you're looking for a movie that you can turn your brain off throughout and still be marginally entertained while watching Robert Downey, Jr. fight people and ridiculously shot camera angles, this is perfect. One might make the argument that it's a smart movie with witty jokes that go over the average idiot moviegoer's head, so therefore it's a brilliant, witty film. Sure, but don't market it then as an action/slapstick comedy and forget to entertain that audience the whole movie.