I don't consider the Hadith significant: moreover the only ones I've read are those that non-Muslims on this site jerk off to. You'll have to ask someone who considers them relevant.
It's my understanding that the Hadith are considered just as sacred as the Quran. Although many Muslims abide by the Hadith, yet criticisms of Islam are based only on the Quran, one cannot help thinking that this is somewhat intellectually dishonest.