Well... This is quite a question, and the very thought of Bush, and further, of trying to define my assessment of his character arouses such venomous malice in me that I could write for days and weeks on it and rant out of control. But in the interest of convenience Ill try to be brief.
Essentially, I would say that George W. Bush is the spoiled son of a President and he has never been held accountable for any of his actions by anyone in his life. I wont go into examples, because you all know enough about his history to know what I mean when I say that he has gotten away with doing whatever he wanted from the start. And thats not a trend I see ending any time soon.
He is condescending, arrogant and also incompetent, but not entirely so. He is good at some things, by virtue of long training. Bush has been raised, trained and vigorously indoctrinated with the idea that politics is business, and that to do good business, you must be good to those in power. Essentially, the idea, or the effect of the idea is that he would continue his families dynasty of power by being a civil servant to the elite rich. All he does is to preserve the power and political representation of the elite rich at the expense of the common people.
He is purely Machiavellian, and, in this pursuit of success, the ends justify the means. The ends are consolidating wealth and political power into the hands of a few, and the means include tax cuts devastating to the national economy, the decimation of the environment, the exporting of American jobs, and sending the sons of the poor to die in unjust war. He is ruthless, immoral and corrupt. He is a disgrace and an embarrassment to our country.