We just got back and stayed at the Marriott with the Escape! Inclusive plan. The price we paid for it was well worth it considering the cost of food and beverage on the island.
Don't be surprised though that this Marriott is not exactly up to normal Marriott standards, I would say it's a three star resort comparable to most RIU resorts. Some of the service people, especially at the Calypso Cafe, are unfriendly. We had a much better time at the Marriott in St Thomas, which is up to Marriott standards.
Also, be advised that the dinner options are limited, but okay for a short stay. The steakhouse is closed Sunday through Tuesday, the food is great but it took us two hours to complete a meal (extremely slow but friendly service). There are only two other proper restaurants: the seafood restaurant and the italian restaurant, both of which are excellent. The three restaurants all require reservations.
Your other dinner-time options include the Calypso Cafe(it has a very small food menu but great burgers), the sushi bar (not included in the inclusive package), and the small menu at the lobby bar (mostly appetizers but they are delicious).
Room Service is not included (not a big deal in my opinion).
After two days, my wife and I decided we didn't want to go to the Calypso restaurant for breakfast. The food really wasn't that great. We found it more enjoyable to grab breakfast sandwiches, fruit, and coffee drinks at the Calypso Cafe.
There are many, many, options for lunch. Our favorite was the Bohemia Beach Pool Bar; it has great food and great views. You could possibly also go there for dinner but they close at 6 p.m.
Also, only the extremely top shelf liquors aren't included (they give you a list on check-in) and unless you order them by name, they aren't in any of the drinks offerred.
The best thing I can tell you is: if you don't pay for the Escape Inlusive package, you definetly won't want to pay for the food and drinks at the resort. The average drink is $8, the average dinner for two is $120, and every bill has a 10% service charge added to it. If you do book the inclusive package and you want to tip, either do it with cash or it will be billed to your credit card.
In my opinion, all-inclusive packages are always the way to go. I saved our receipts from our six day stay at the Marriott and they total over $1000 for just the two of us.