It has a silly score of nearly 9.0 on imdb. The best superhero film since the Dark Knight and let's be fair that film took the genre to a whole different level.
The general concensus seems to be it is the absolute dogs bollocks so I will definately see it. For Superhero films, The Dark Knight is my favourite but I also rate Watchmen very highly. V for Vendetta although not a superhero film as such was also superb imo.