I think W's/USA's actions in the ME will historically be viewed as the moment when the ME started on a long path to Democracy and freedom. Yes, I truly believe this.
I also believe most of the domestic "frack ups" W has done will ultimately be forgotten.
Being a traditional conservative myself (not whatever is being called "Republican" today) I think Bush has failed on cleaning up (eliminating) the IRS, making government smaller, immigration policy and saving the puppies.
So, the most controversial and derided policy today will be the policy that will eventually frame W as a great president.
Best,
Kurt