Mr Wooo, if I had to eat whole food protein sources at every meal, I'd lose a lot of weight due to feeling just too full and not digesting the whole food by the next meal.
So in my opinion, the powders are great, give you fast acting protein for post workout, mixes very well in cooked oatmeal, or grind up oats and almonds, add protein powder and there's a solid shake. Add an apple for more carbs/nutrition or whatever.
Just don't believe the claims they make boasting the effectiveness of them. You could get 3 meals, 3 shakes per day and do very well.