There's another thing about WW worth mentioning. And don't get me wrong, I think WW is a great tool for folks who don't want to be bothered with details. It IS easier to track calories than the way we do it IMO, but I prefer this way because I actually learn about nutrition.
Now the other thing about WW is that you don't get the micronutrients calculated for you. So if you've got a deficiency in magnesium, which is an easy thing to be deficient in, you'll never know about it. And just taking a multivitamin won't do the trick as they don't supply the RDA of Mg. So how important is this? Well, without a good amount of Mg in the diet one will always feel tired at the least, and at the worst, a deficiency has been linked to strokes and heart attacks. So there's yet another reason how a packaged "diet plan" can be lacking.
Think of food as fuel for the body instead of feeding emotions