This is very similar to my family's recipe. We do, however, add a few eggs to the ricotta cheese (to help hold the lasagna together) as well as some seasoning, which is why one of the reviewers probably said the recipe was a little bland. Add black pepper, some nutmeg (a pinch), some parmesan cheese, and some fresh or dried parsley.
In addition, his sauce is a great starter. Cooking some meat in the sauce will yield a richer taste (if you eat meat). I bake some sausages in the oven to get rid of the excess oil, then drop in the sauce to cook. These can be served on the side, or cut up and added to the lasagna in slices. Same goes for meatballs.