I love Jack's. I make the drive down from Providence at least once a week, and if I have an extended lunch break, I'll make it as often as possible. The menu is huge, with offerings from Award Winning Italian to Seafood to Portuguese. They have a great little lunch menu and the service is always great. One thing I especially like is the daytime bar service. The bartender is opinionated and surprisingly well versed and willing to engage in conversation on almost any topic. It's got that old time feel. I call it dinner and a debate.
Pros: Parking, Service, Smelts, Seafood Pasta, the whole Menu
Cons: Location (but still worth the drive)