I generally don’t like it. If I get a sandwich made or something I’ll ask for no mayo. Most restaurant/chain mayo sucks. Heavy on the oil and other things that mess up a flavor I’m not keen on in the first place. There are some things that need it, like egg salad, and that’s fine. I don’t mind adulterated versions like chipotle mayo or sriracha mayo. However, if it’s a good mayo, it can really make a sandwich, especially if there are complementary ingredients like avocado.