Adam Felber delivers a great version of the incompetent design argument here. Just an excerpt from the masterwork:
GOD: THOU SHALT TELL ME YOUR GRIPES!
STAN: Okay, okay. Uhâ€¦
GOD: Go on.
STAN: Okay. Putting the reproductive stuff so close to the waste systems is going to cause a lot of infections, see? And look at this thing, this â€œappendixâ€™ – you just left that in there from your horses and whatnot and itâ€™s not even going to do anything except occasionally explode and kill its owner, right? And I hate to harp on the upright thing, but couldnâ€™t you have reimagined these â€œfeetâ€ to be a little more durable, or do you actually want their arches to collapse and the whole thing to hurt? And this whole genetic system opens the door for spontaneous and/or hereditary mutations that can cause devastating diseases and defects that can be passed down and physically or mentally cripple some of their offspring right outa the gate.
STAN: I guess what Iâ€™m saying is that with you being all-powerful and all-knowing, why would you use 98% of your chimp design and cut corners on your most important creation?