It's a lot more helpful to go by calories, macronutrients, and micronutrients. Shoot for a certain number of calories per day comprised of certain percentages of protein, carbs, and fats, and aim to get as many nutrients as you can.
I eat about 2500 calories per day. I probably get about 60% fat, 25% protein and 15% of that as carbs. Probably about 250 calories are coming from some sort of vegetable. There really isn't any requirement for vegetables or any particular goal one should shoot for. Only various nutrients from vegetables that would warrant eating them. the whole "servings" mentality stems from the food pyramid concept which stems from farmers concerned about selling food so it hardly makes sense to be measuring food in terms of commerce rather than nutrition.
Stabbing conventional wisdom in its face.
Anyone who wants to talk nutrition should PM me!