I won't presume to tell you whether it's worth it for you. But I will help you determine that for yourself.
Barring putting your choices down, then adding them all up and seing which comes out ahead (a full cost-benefit analysis), here's an easy way to kind of get a rough Idea.
The key to the whole thing is the sit downs. How many sit down dinners do you have planned? If it's a bunch, you're probably going to get your money's worth especially if you already have a bunch of al-la-carte places among your choices. You may only have to add one or two more to those you've already planned.
In such a case the meal plan will very likely save you money.
If you don't have alot of sit downs planned, then you may or may not get your moneys worth but you will have to change your behavior to get it. Only you can determine if you fall into this category whether it's worth the extra expense to you to go ahead and get the meal plan and splurge and eat higher on the hog than you normally would.
Hope this helps.