if you're referring to liquid vs. whole food for protein alone, then i don't think it's that big of a deal.
however, you can only benefit by getting varying amino acid profiles from different proteins, plus the slowed digestion of whole food protein.
but for the most part, i think the whole shake vs. food thing has been blown out of proportion. i just wouldn't recommend getting all your protein from shakes.
that said, i eat 6 meals a day, and whey makes up my protein for 3 of them. the other 3 are whole food sources (chicken, eggs, fish, beef).