I'll mix a cup of oats in my protein shake for some carbs. If I drink it instantly I just have some chewing to do, if you let it chill in the fridge for a bit it's totally drinkable.
I tried raw oatmeal once in my protein. It gave me a serious buzz.. Or was it a headache??? Either way, I will never try it again. It tastes much better to me cooked with raisins.