Always always wait for the 1st or 2nd patches. Most PC games get a good preorder crowd and a "I must have it crowd" who fill thier forum sigs with free fixes for the games they just purchased (genius's). Its an advanced beta process, that works look at MTW2 and the moaning about the shield bug etc, modder comes along and fixes it and bam! hes now working at CA (lusted).

Let the preorder boys beta it for you, wait for the patch or user fix then you purchase. Anything other then that then you really have no cause to complain later