I would recommend sauteing some onions and peppers first and then add the marinara. That way there's a little crunch to diversify the texture in this dish.
Also, whats an Italian dish without garlic...?
Otherwise, really tasty dish. At first I didn't think it was filling at all, but then I drank a lot of water and now I'm completely full.
If you're splurging (or cooking for someone else not on WW), put half of a toasted english muffin underneath.