Disclaimer: Yes, I know that the web abounds with unqualified, opinionated, amateur movie critics, each of whom thinks that one-click publishing entitles him to broadcast his ideas. I hereby shamelessly assert my right to join them.
Go See Because: Actually, I recommend seeing it twice. It's one of those stories that gets better with a second viewing; you'll be able to see more clearly past the garish elements. You've got to love Claire (Kirsten Dunst), whose compassion and disarmingly self-deprecating confidence put her center stage in the life of Drew Baylor (Orlando Bloom). Her sense of appreciation for the full experience of life, her desire to share it, and the multiple make-you-think lines in the movie--"Success, not greatness, is the only god the world worships"--make for superb entertainment.
Go Cautiously/Avoid If: You're a girl aged 12-15 and don't have a firm grip on your heart. Remember what happened when the Lord of the Rings came out.