It all depends on what specifically is meant by 'design' (which is largely my point).
If we say that ANY end product is the result of design then for the IDers we are looking for evidence of Intelligence in the design -- in which case good/bad design may be a minor indicator.
I tend to think of 'design' in terms of whether the end product was intended from the out-set or not -- so maybe my concept of design is different.
For example: There are two approaches to sculpture:
1) I decide what I want to make (e.g. a statue of David). I then select an approriate material (I think I'll do this in marble), then find a suitably sized piece of material (hmmm ... at least six-feet). I maybe do some sketches, then get the chisels out ... a while later there I am ... statue of David.
2) I'm walking along the shore and I find a piece of drift-wood. 'Ooh' I say to myself (possibly out-loud) 'this looks a bit like a horse.' I then set about the wood with my knife making it even more like a horse.
1) Is what I would call 'design'
2) Isn't 'design' so much as whittling away the bits that don't fit.
So ... maybe I need to review what I actually mean by 'design' before making too much of good/bad.
Hope that's clearer