For me personally (and everyone is certainly different), going to the meetings really helps. It's not that they talk about anything that I probably didn't already know, but the support and reminding I need I really get at the meetings. I really do better when I attend the meetings. WW has also done some studies that people who stay for the meetings are 60% more likely to lose the weight. The meetings help me stay motivated. I will say, however, that having a good leader and group is really key. If you don't care for the meeting group you try first, try a different one. To be honest, I don't care for the leader who teaches the meeting right before mine, but I love my leader. It really makes a difference.
I am just starting my WW 3rd try (but the first try was eons ago). I lost weight, then gained it all back (to be honest, due to laziness) plus some extra. I am committed again because I decided that I truly do want to lose weight (for a while there I thought I might could be content, but I realized that losing weight is really what I need to do).