I am coming to this discussion late but I have 2 cents on me. I believe in evolution guided by beings that are far beyond us in their type of intelligence but not Omni-everything either. I think Dawkins wants to create this false dichotomy that evolution is either the work of unthinking natural forces or the omniscient God and then ask: Which is it? I see it occurring in a third method; by beings that learn and experiment. Hence the current eye was not designed from scratch as Dawkins implies the God theory has it.
OK, first, there is no need to postulate any magical intercession. Why do you think the ordinary mechanisms of evolution are insufficient to produce an eye -- or any other biological structure?
Second, divine guidance must needs involve magical alteration of the laws of Nature -- chemistry, physics, &c. It means God reaches down to suddenly alter the laws of gravity, motion, conservation, inverse square, &c. Science has never discovered any such intermittent aberrations.
So there is neither need for nor evidence of magic. Why even propose it?
Yeah eagles can see better, but they cannot smell or taste things. All their brain power is used up in managing the vision. You will be able to see quite well the poisoned food that you eat as it kills you.
Turkey vultures, though, have an extraordinary sense of smell.
Exclusively sight predators just don't need to smell a rabbit a Km away, as long as he can see it.
Unneeded complexity and energy wasted on unneeded systems is bad engineering.