There really are too many variables to answer the cost compare question acurately for everyone. I recently did this for my sister. (showing info here)
I basically looked over variour menus on Allears, and got average prices at different locations. Then compared that to the Basic Dining Plan.
Adult: QS brkst 11 - QS lunch 12 - snack 3 - sit down dinner 30
Child: QS brkfst 6 - QS lunch 8 - snack 3 - sit down dinner 12
Since thq dinin plan allows for 1 QS 1 snack and 1 sit down, I dropped
the breakfast amounts from my comparrison (since that was the least
expensive, and the worst value)
Out of pocket: Adult 45 + Child 23 = 68
Meal plan: Adult 52 + Child 16 = 68
Long story short - If you do everything average, its a wash. If you use the meal plan for higher end meals, its a deal. If you leave some snacks/meals unused its a loss... But if its a free plan, then its a real bargain.