The concept of Intelligent Design certainly raises excellent questions, particularly about the problems of natural selection as an explanation for complex systems. But its alternative answer – life was designed! – isn’t helpful. Or, at least, it’s not scientifically helpful.
Just saying something is "designed" provides no insight into the process by which that took place. Science is about defining that process, and unless Intelligent Designers can provide scientific evidence of an alternative process to evolution, just touting “design” isn’t adequate.