Jamie Todd Rubin laments at length on the variety and complexity of rating systems on his blog today. I think it might be slightly in jest, but this is precisely the sort of pedantry I can get behind. Here is his suggested rating scale:
1-star: Distraught. Way below my expectations.
2-stars: Disappointed. I’d expected more.
3-stars: Satisfied. Met my expectations.
4-stars: Delighted. Exceeded my expectations.
5-stars: Blown away. Far exceeded my expectations.