I believe GWB to be a good man. I also believe him to be slightly smarter than average. Unfortunately for him, the presidency requires a very smart person, not slightly above average. Bush was over matched, and one could construct the argument that Bush's failures gave us Obama.
I wish nothing but the best for GWB. I believe he was treated unfairly by the media. But, he left a lot to be desired as president.
Having said all that, Obama makes GWB look like Ronald Reagan.