Acording to intelligent design complex stuff need a designer . If you see a watch in the forest you know its designed. Well yea you have a point tough that watch was not designed by 1 person some designed the parts some designed the shape and some people put it together.
If you find a computer in the forrest you know it is designed well sure but there where tonesof people involved in the design of the computer
Just about everything designed that we see is designed by lots of designers and the more complex it is the more designers we have. So why do you assume that only one designer designed a universe as complex as ours your own logic points to there being tones of designers some designers designed stars, some rocks, some planets, some plants, some bacteria, some animals .......
Well, here's my answer to that: why more than one designer? using your same logic, (creationist logic) if one designer has ultimate intellegence, like creationists (I'm speaking from a Christian's point of view) believe, why have more than one, when that one can make it all by himself without any help? Plus, i'm sure, that if a watch maker wanted to, he could design a whole watch, and assemble it all by himself anyways, people like small business watchmakers do it all the time.