To be completely fair, the restaurant analogy just doesn't fly. It only works if you look at it like an all-you-can eat buffet where you pay one price for everything when you walk in the door.
In this case, you paid $6.00 on this trip. As part of the deal, you're entitled to EVERYTHING in the store (DDI Content) for that $6.00. The deal is just that whatever the kitchen makes is what you can get - sure, you might LOVE steak, but they just don't have steak right now. You'll have to make due with the chicken and a bowl of soup.
They're not obligated to provide you with steak. But they are obligated to provide you with food. They've done that - you can still get your Dungeon and Dragon magazines, you've still got access to the Compendium. Sure it's not the steak you hoped for, but they held up their end of the bargain by having food available on the buffet table.
Edit: I see you got your refund, P1NBACK, as have others. Good for you, and good on Wizards, but I suspect it has more to do with the squeaky wheel getting the grease than any kind of feelings of guilt that WotC owes you anything. =/