I have had success with Weight Watchers and in the beginning I was also hungry. What helped me is the types of foods I was eating. I tried to keep a balanced plate and have enough protein to keep me from feeling hungry. Also, it was important to drink the 7-8 glasses of water - that helped me feel full. And finally, adding in exercising allowed me to balance out if I was adding additional healthy snacks. Just like logging food in FitDay - if you are staying within a calorie range - it factors in the calories you burn during exercising.
So the main thing in Weight Watchers is to be sure you log all you eat AND exercise to see exactly where, when, your points are going.