The problem with the marketing is that every ad I've seen for it makes it seem only good for making healthier, less tasty versions of food I like.

What it's actually good for is cooking some things faster than a conventional oven, reheating fried foods.

I have had success making good homemade french fries with my air fryer, but I still thoroughly toss them in oil before cooking them. The end result is not really much healthier than if I deep fry them, but it is a lot easier and less messy.