According to Surat Ali-Imran and Surat An'Nisa, and basically the WHOLE Quran make the existence of the Hadith HARAM. Why? Simply because they added new sins. That is creating a lie or falsehood against Allah.
Ask yourself, what's more important, the word of GOD or the jumbled up inaccuracies...
In Islam as a general opinion it is haram, prohibited. The following verses are often cited as evidence for it:
23:5 "And they who guard their private parts"
23:6 "Except from their wives or those their right hands possess, for indeed, they will not be blamed -"
23:7 "But whoever seeks...