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You're pretty much stuck with the SkyClubs in Delta's T2/3 complex. There are a few of them and one of them (I don't remember which) is known for having better snacks out prior to the bank of European flights. Other than that they are not much to write home about. At least you've got free booze and wifi to keep you busy.
You will have enough time that you can wander over to T4 and enjoy the land-side "mall" that they have in the terminal if you get bored being inside the T2/3 complex.