Are you sure your not confusing intelligent design with optimum design? Optimum design is perfect design which doesnt really exist.
Why would a perfect God use a less than perfect design?
The argument that "God wouldnt have done it that way" seems like a questionable way of proving that man isnt a machine
You have it the wrong way around. We now know that man evolved like all other life on earth, it's just interesting to point out that the counter argument - that he was created fully formed by an all powerful, all knowing and perfect, supernatural being - doesn't even make sense in it's own terms.