I'll quote from a portion of a review I made of the place a while back from my own food blog (modesty prevents me from giving out the URL):
The food at Chunky's can be best described as Classic American. There are appetizers ("pub grub"), salads, burgers, sandwiches, wraps, and a small selection of entreés. All the menu items have names related to the movie theme of the place. For instance, "Love Me Tenders" is the name given to the chicken tenders entreé, and there is a "Kevin Bacon Burger" (bacon cheeseburger) and "Robert DeNiro Burger" ("Cheeseburger with an attitude") as well. Side dish selections include potato chips, pub fries, cole slaw, pasta salad, baked beans. For an additional charge, you can order waffle fries, onion rings, or a side salad instead. Desserts aren't forgotten, and most have a "Harry Potter" theme ("Gryffindor House Special" is a brownie sundae, for instance). For those over twenty-one, there is a limited cocktail menu as well.
The food is very good, and although it would never be considered gourmet fair, it's quite a bit better than the food I remember from the concession stands at the old drive-ins. The prices are quite reasonable as well. Service is usually pretty good, but when the place is crowded, the wait staff can get overwhelmed. A recent "re-innovation" is that the restaurant now offers a "coaster" that works as a reverse-pager; turn it on and it will let your wait-person know that you need something, which can be very useful in the darkened room when the movie is playing. This is similar to the "pagers" that the original venue had, and is a welcome return.
Although there is a full menu, you are not obligated to have a complete meal. You could just order munchies and drinks, have a bag or two of popcorn, or even pass on the food and/or drinks altogether (although that would miss a lot of the fun of the place to my mind).
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I hope this answers your question.
We do Chunky's often, not all food is created equally but we do enjoy Nashua and Pelham. It's nothing to rave about but just good pub food. I enjoy the steak tips and burgers. Get there early enough to enjoy most of your dinner with lights on - otherwise your attention isn't on the movie when it starts.