I'm no Obama or Clinton fan, but Benghazi seems like a case of pretty typical government incompetence. You've got a state department that underestimated terrorist threats, a department of defense that misunderstood the situation unfolding on the ground, a CIA that seemed more concerned about protecting some clandestine gun running operation, etc.
The most damning things to me are State's refusal to provide additional security to a consulate in Libya, and all the lies afterward to avoid political damage. Hillary's role in the YouTube video charade is one of her most galling lies and should be a disqualification for the presidency.