Manny's corned beef or pastrami is nothing special. I've ordered sandwiches for carry out, and they were as dry as a popcorn fart. Manny's doesn't even get close to the level of Jake's or any variety of New York deli's. It's overloved because it's the most visible and one of the few real deli's that we have in Chicago. As far as their other products (I've heard the oxtail stew is good) I don't know, but the corned beef and pastrami are a waste of time, based on a quality and price standpoint. Same with the roast beef.
And don't even think of going to Manny's at Midway. I grabbed a sandwich from there a couple of weeks ago figuring it would be serviceable meal on the plane. No dice. Rubbery, fatty corned beef; I felt like I was in a "Three Stooges" episode where they bite into a shoe and just look around at each other while chewing and chewing endlessly. Threw it out after a couple of bites.
I thought the corned beef a little dry too. But excoriating a juicy pastrami sandwich for being greasy is much akin to knocking Marilyn Monroe for being voluptuous.
Just moments ago i finished a Manny's fly by Midway pastrami sandwich here on the plane. Although I've often had worse airport food, I've never had better. My bona fides: bridge and tunnel raised in the heart of the golden age of NYC deli's. In the last year I've had Sarge's in NYC, Langers in LA, Kenny and Zuke's in downtown Portland and Manny's. All good. None perfect. The best: the one that serves it the way you like.