What is the movie sucker punch about?

sucker punch is the best movie iv ever seen its about 5 girls trapped at a mental home working for a man named blue as dancers and kinda hookers , they try to escape and whenever baby doll dances it distracts all the men and it takes them into another world where they fight the bad guys but the bad guys are an army of monsters i guess i doing a really bad job explaining it but it was an AWESOME MOVIE.