Proposing that something must have caused the big bang doesn't mean it's reasonable to prescribe any properties to that something, whether that's intelligence, knowledge, ability to effect the universe, all knowing, all powerful, or all good. The arguments for the universe being designed seem to me to be arguments from ignorance. However improbable it might seem that the universe is the way it is, it doesn't mean much given our lack of understanding. We don't know why the universe is the way it is. Saying something is designed only makes sense if we know of the designer, and in this case we do not know of a designer. Calling it "perfect" seems meaningless to me.