One negative reaction I've gotten to my "cosmological argument" is that it's tremendously subjective.
Yep, it is. Guilty as charged. In fact, I mentioned that when I offered it - it's an argument that only applies to myself, and to other people who look at the world and see design. Call it instinct, or intuition, or whatever else you want.
The idea that this should somehow -not- count, or doesn't constitute a 'real' reason to believe in design, really seems to spring from the conviction that beliefs must always be based on wholly (or as wholly as possible) objective criteria. Which, I can't help but suspect, seems like another incident of modernism - trying to make our metaphysics and philosophy as objective and therefore 'science-like' as possible. And as I keep saying - there's a place for that. Rapt, rigorous metaphysical and philosophical arguments are useful and great, and something I defend.
It's just not wholly necessary. Not to reasonably justify a general belief in a designed universe. Call it like you see it. Does the universe look designed to you? Well, there you go. Believe that. Admit that you could be wrong, but at first blush, that's the way the evidence and intuition stacks up, if it in fact does for you.
I think what may cripple some people here is the possibility of being wrong - of recognizing that just because something seems a certain way doesn't mean it is, in fact, actually that way. I don't think this is a reason to withhold a measured belief based on subjective criteria, however - it's just a reason to, at worst, be suitably reserved with the belief. Moderate yourself. But a strict agnosticism simply isn't necessary.
It's weird that what I'm saying here has to be said. "It's okay to trust your intuitions and instincts to a degree. It's okay to accept, suitably moderated, the evidence as it appears to you at first blush, all else being equal." How did we reach this point where even this basic amount of self-reliance seems alien and scary to some? (And I'm not referring to Gyan here, but to other people not on this blog so far.)