You do need to pay attention to the drink package levels. A friend ordered a beer under the belief his package included it. Nope. He had to pay for beer separately. He also ordered a martini one night, which definitely was included, but it was at a bar where they used larger martini glasses so they charged him for the drink. It seems the package only included martinis served in the smaller glasses which weren't used at the martini bar.
I really don't see it as a good value. I also think Celebrity is deliberately vague in their package descriptions.