As a person who habitually used to return apple laptops with light bleed, trust me when I say that it's completely within what would be considered 'normal' in the laptop display industry. It's been many years since I've seen an Apple laptop that didn't have some kind of bleed -- the last one being the much dimmer display in my mother's 2006 powerbook G4. Remember, this is TN technology and they are illuminated differently than desktop displays.
Unless you want to gamble and possibly get a worse one, I'd stick with what you got.