Jason's Deli ranks as a solid 3 stars in my book. This is based on multiple visits and having tried various sandwiches/wraps and even the salad bar several times. I think that their food just doesn't stand out.
I do appreciate their 'healthy' options on the menu (with calorie #s, too) and I do appreciate their salad bar that has a pretty good selection (note that dessert is part of the salad bar.. odd, I know), but I just have to say that nothing I've eaten here has ever made me want to come back.. nor do I ever get a "jason's deli" craving.
Their staff has always been adequate and friendly and the facility itself seems to run smoothly (ordering and food arrival is pain free and quick) and is fairly busy at lunch time (it's near a mall and lots of businesses nearby), but, again, their food is OK. If I want a 'salad', I just go to Whole Foods and do their 7.99/lb salad bar that includes all kinds of meats (Jason's doesn't).. if I want a sandwich, I go to Wildflower for interesting ones or even Sprouts for plain and affordable ones... leaving Jason's at a solid 3.
You do get free soft serve if you eat there, though.. that could be enticing enough for some people.