Movie Marketing

The other day I was at Wal Mart browsing DVDs. There was the new release of P2, and on the cover it has a quote by Ebert, along with a 3 star rating.

3 stars. On the DVD cover. Did the marketing team not get the memo that movie ratings go up to 4 stars? Or, was there not a single 4 star rating of the film? Am I the only one who thinks someone messed up?