Now don't shoot the messenger, but I can see what he's saying in context.
How often do you hear about a kettle or WSM that's "out of round"? The metal on a kettle is noticibly thinner than your typical decent offset smoker. It is also has much thinner walls than the kamado smokers. I don't knock him for that observation, but what he should have mentioned was that the Weber is also porcelain enameled which allows it to retail heat far better than your standard flimsy metal Big Box retail store grill which isn't coated in any way.