Is the film Black Swan worth seeing and rate it on a scale of 1-10?

I still need to see it. 2 of my friends saw it and said they had nightmares and that it was very intense. Is black swan worth seeing and rate it on a scale of 1-10?

its a 7/10

the best reason to see it is; there are some really great scenes involving Natalie Portman and Mila Kunis (if you know what i mean) :P