Yes, Roman Polanski is a wonderful filmmaker. Yes, the then-13 year old girl he had sex with in the 70's has since forgiven him and expressed her wishes that Polanski not be punished. Yes, the crime was committed more than thirty years ago.
And yes, Roman Polanski should be extradited to California from Switzerland and face time in prison. The man admitted he had sex with a minor and then ran to Europe when it seemed like he would have to serve jail time. Not punishing him would send the wrong message. If you are powerful enough and evade the law long enough, you can get away with criminal behavior even after you're finally caught.