1. I don't trust the source. Did it come from China? Is there really 30g of complete amino protein per serving? What assurance do I have that what the label says about the contents is true? When I microwave egg whites containing 100g of protein, there's no mistaking that they are egg whites.
2. If I'm dieting I want all the solid meals I can get. I don't understand why people use liquid nutrition when dieting.
3. I like to cook. I like to eat. Don't really enjoy swilling powder shakes.
If the quality of the whey isn't in question then there's nothing wrong with it. Although it's nutritionally sparse compared to proper food (but a good source of glutathione), it's convenient and an acceptable source of protein when used to supplement a balanced diet. I just haven't bothered with it for awhile now.