Writing about the movie industry for a living is more than fun (it's FUN!), but there are some pitfalls. Notably, that for every great movie (like 'Young Adult,' out now) there's a tremendous dog (like 'New Year's Eve,' also out now). For film critics -- who can often see more than 100 films in a given year -- that means not every review is going to be positive. In fact, some critics seem to delight in writing a perfectly crafted slam -- and who can blame them, really? Ahead, the 11 most gleefully nasty reviews of 2011, from the surprising ('The Artist') to the surreal ('Jack & Jill').