Well, they're just wrong. First off, MW isn't "mayo," nor is it a mayo substitute. It's a "Salad Dressing." Mayo is fine for recipes (try it in a cake, it comes out incredibly moist.) But when it comes to sandwiches, Miracle Whip RULES! It's a little sweet and tangy. It actually adds flavor to the sandwich, as opposed to being a tasteless lubricant.
That's right, I said it! Miracle Whip RULES as a condiment!!!!
Mark
I agree about sandwiches, especially BLTs.