Just a comment from someone who is actually on the Nutrisystem diet.
Yes, you can lose weight on the program. I've lost 22 pounds since November 21. I was at 230, and I'm at 208 right now.
The food ranges from terrible to pretty dang good. There's way more pretty dang good than there is terrible. The worst time is lunch where everything seems to be so-so (one or two exceptions). I have never had an order substituted yet. The online order system doesn't let you order things that aren't in stock. Almost all of the dinners are in stock all the time.
If I had my macaroni and cheese and the NS mac and cheese side by side, of course I'd pick mine. But the food is fairly good.
I like the program because it does do everything for me. I provide the fruits, veggies, and dairy/protein. The men's diet averages 1400 calories a day. Yes, I do get hungry at times. I just drink another glass of water. Otherwise, I don't have to think about it and the pounds are heading somewhere else.
If you compared the Nutrisystem diet to the US Food Pyramid, it's very compatible. If you want to lose weight, it's worth a shot. Since it does work, I like it a lot.