If you take a few extra minutes and drive out to E. Greenwich, I'd suggest Jigger's Diner. It's a great, retro space, very cheap, delicious, not-the-most-healthy food place around. Warwick's a fast-food ghetto, unfortunately.
Not a fan of Dave's but I was going Prov to Warwick Ave....Post Rd and down by the mall is too far for my limited lunch hour. Never made it to Bilkens.....I thought I knew were I was going but I was wrong. "Lunch" was a Zone bar and a bottle of water in the car. *sigh*