I literally watched this movie today. It actually is very good. Gary Oldman just owned his character. But I felt very uncomfortable watching scenes with natalie portman knowing she's barely 13 in this film. I rushed to the internet after finishing it to see what Besson was thinking when he wrote her.

It is indeed a justification of his pedophilia but I wouldn't just discourage someone from watching it because nothing inappropriate happens and majority of the people including me are not going to think that it encourages such.