I am quite partial to The Bagel, as I have posted previously. While I do not eat red meat so cannot speak to their Corned Beef or Pastrami, I can speak favorably to several of their traditional Jewish-style foods.
Their Matzo Ball Soup is always as it should be, with the Matzo Ball firm but able to be gently taken apart with a spoon. Not quite feather-light, as my Grandmother's were, but the best I've had in Chicago by far.
The homemade Gefilte Fish is outstanding. Sweet, with a nice firmness.
The Challah is excellent, and a great accompaniment to both the soup and fish.
The Turkey Reuben is very good and alot to eat, though no Turkey Reuben matches up to that served at Ron's Bagel Deli in Suburban Detroit.
The cold fish salads have been uniformly good, with Tuna and Whitefish the best bets.
Areas of edible improvement:
Pickles at The Bagel, and every other Jewish style deli in Chicago, don't have the bite of the pickles I grew up with in Detroit. I don't miss much about the old hometown, but I do miss Topor's and Raskin's Pickles, and find Bubbie's Pickles far better than those at any of the local delis.
Again with the Detroit deli comparison, The Bagel Potato Salad and Cole Slaw could use some Detroit deli help.
Service is variable, as it is at every spot in the North Lincoln Park/Lakeview neighborhood at this price point. Some of their servers are attentive and friendly, while others seem like they would rather be doing anything but their job.