I'm always tempted to go to Corky & Lenny's when I'm in the Chagrin Boulevard area. I've loved those huge corned beef sandwiches since I was a kid, when it would be a real treat to make the trip to the east side to eat. I haven't tried some of the other big names in Cleveland corned beef (i.e., Slyman's), so I'll reserve judgment on any "best" tags. I'll just say that the corned beef sandwiches here are excellent and miles above what you would probably get at an average corned beef sandwich place.
I haven't had much else on the menu besides the corned beef. The potato salad is pretty good and the matzo ball soup was okay. Just having chocolate phosphates available is a plus, and I'll take Corky & Lenny's chocolate phosphate over Alvie's (who I don't think even serves them anymore) any day of the week.
I wanted to give Corky & Lenny's four stars (admittedly, this isn't the "fine dining" scale), but I dropped it down to three based on service and the overall appearance of the restaurant. Granted, it's a deli, but I think service could be a little quicker and friendlier, and the restaurant could be a little cleaner. Some might say that this adds to the character of the eatery, but there is plenty of room for improvement that won't at all change the deli-nature of the restaurant.