The voter turnout for the 2004 US Presidential Election was 60.7% (http://www.washingtonpost.com/wp-dyn/articles/A10492-2005Jan14.html)
Despite being threatened by terrorists, Iraq's voter turnout was much greater than the last US voter turnout!
I'd say it was a far greater success than expected!
There were a few suicide bombers, but reports on CNN indicate that as soon as the sites were cleaned up the voters immediately returned.
CNN also reported an instance where some terrorists were driving around in an ambulance tossing hand grenades at people... a crowd surrounded the ambulance and forced the men out who were turned over to the authorities.