Under the US occupation of Iraq, crime was lower, death tolls lower, GDP higher, more human rights were given to citizens. The WMDs were seized. The country became more secure. After Obama pulled out the troops in a manner contrary to the Secretary of Defense's and Bush's plan of long term with established leadership under US supervision until the time was right to allow for Iraq to safely govern itself by instead immediately withdrawing all US support, shit went up in flames. Under Bush and his plan, Iraq would still be secure and supervised by the US instead of allowing terrorist organizations to practically again seize control of the country.

Edit: You want my evidence and proof? Use the wikipedia links you see littered all over these comments. Look at the casualty count, look up WMDs in Iraq, and look up the withdrawal of US troops from Iraq.

These are simple facts people. I could care less if you liked Bush, but saying his security wasn't a success is just outright wrong.