I read an article on Huffpo citing a study claiming that conservatives are lazy thinkers (calling Dr. Obvious). There was some heated discussion in the comments section as to whether conservatism caused lazy thinking, or vice versa. To me, it doesn't really matter.
My major problem with conservative policies is that they lack foresight. In my home state of Arizona, almost every piece of legislation produced by our Republican controlled legislature seems to be a reaction to some perceived threat.