It does amaze me that the eye got brought up so much when people where still brave enough to call it creationism. It's an amazing structure to be sure but it's a bit... hap hazard... if you are going to call design intelligent then you've got to admit that the designer more than likely would have a concept of elegance. Achieving a complex task in the most effective and simple manner is a core concept of design so if you have the power and will to design life on a planetary scale are you really go for the first convoluted mess you get working or are you going to strive for an elegant result? I bet they might say "but ah if it was to elegant we'd know it was design and there would be no need for faith" at which point we uncover the fact that this whole mess is not fooling any one in to thinking it's about anything but trying to preserve a given type of faith. They may also just claim that the mind of a designer that powerful is unknowlabe and it must have had it's reason but then you uncover the fact it can't be science if you are going to fall back on that old chestnut.

tl;dr

The eye is amazing but it's also a bit stupid. Which runs counter to the whole "intelligent" and "design" bits.