Just a quick warning on BB Wolf - it's not a reuben - it's a pastrami reuben hot dog.
Personally I find Boardwalk Deli to have really nailed the corned beef (they also sometimes have a very good pastrami) sandwiches - they feel the closest to NY Style Deli meats.
The Rueben sandwich at the BoardWalk Deli is excellent. Since we stay at BWV, I take it back to our villa to,eat. Generous enough for me to get two lunches if I add a second bag of chips from our in-room snack selection. YMMV.