I am late to this discussion so if what I have to say has been said, apologies.
Insofar as there have been over 40 presidents, the OP of this thread seems to present George Bush as being at least somewhat bright. The matter of guess-timating presidential intelligence is a debatable one at best, but that said, IMO, as goes depicting GWB as being 27th reflects an idealized assessment of that man's mental acuity.
No other president during my adult life gave me more occasions to have to defend his, and by extension my nation's, actions than did Mr. Bush. Time and time again in my personal and professional travels abroad, I was asked, "What is that man thinking? Is he even thinking at all, or does he only act upon his knee-jerk, emotional motivations? How can your people have elected such a stupid man as your leader?" Indeed, I'm hard pressed to
The matter of estimated presidential intelligence was raised in the public arena this past spring here:
Poindexter in Chief: Presidential IQs and Success in the Oval Office .
I don't particularly need a president to be a genius, but I do expect the person holding that office to be at least as smart as I am, although smarter is preferable, and it'd also be good for the president to be smarter than the average American. Mr. Bush is living proof that no matter how improbable it is for something to occur, sooner or later it will. Mr. Bush showed that to be so when he, a mental midget, contrary to all rational prognostication, won the presidency and then proceeded to demonstrate to the world just how bereft of complex thinking skills he is.
When one becomes U.S. President, there's no denying that one will become privy to scads of information to which we "mere" citizens lack access. It's how one processes and analyzes that info that shows how smart one is. For example, at Mr. Bush's behest, Gen. Powell averred to the world that there were unquestionably WMDs in Iraq. It would have taken very little to have instead asserted that "according to our best intelligence, we feel confident there are WMDs in Iraq." Merely making a strong assertion that nonetheless made it clear to everyone that our level of certainty was less than 100% would have been a far smarter approach to take. Mr. Bush didn't see that to be so; moreover, it seems he didn't even consider that it might not be so, for had he the sense to know that little can be said with 100% surety, he would not have claimed the WMDs existed and in turn wasted over a trillion dollars prosecuting a war to find, capture and destroy them.
The WMD motivated Iraq war was just one blunder of global proportions that happened on Mr. Bush's watch. The financial meltdown of late 2008 is another. Might Mr. Bush alone have been the root cause of either or both? Well that is hard to say for sure, but what's not hard to say is that when one is president, one gets to take credit for the good that occurs during one's tenure and one also must bear the burden of responsibility for the failures that happen in that period. Heavy is the head that wears the crown.