This is a great, delicate recipe. Add the cheese upon serving and add salt and pepper if it is too bland for you. Personally, I love just tasting the cheese without a lot of garlic or other seasoning. If you have good cheese, you will have flavorful pasta.
Worth noting that this recipe is listed as being vegetarian, or is at least lumped in with other vegetarian recipes, which it is most certainly not. Pecorino Romano contains natural renet, rather than the microbial (manmade) alternative which IS.