Went to Jar a while back and was disappointed. The place was very dark---very, very dark (the man next to us had to use a flashlight to see the menu!).
The pot roast was $29, and was just a small piece of meat--NO sides, those were extra! It was okay, but mine is better :).
We had their shrimp and crab cakes as an appetizer, which were mediocre.
Service was slow (was a weekday but rest was full). The dessert was delicious (forget what we ordered). I can't find a reason to return.