As a internet wanker posting from my own basement I'd say this,
a) He never flew off of carriers, and joined the National Guard to avoid actual combat service. There is also every indication that he went AWOL during his service to avoid drug testing.
b) As the son of the family he was in (at that time in American history), getting into those places is not that big of accomplishment.
c) He beat Ann Richards who was only the Governor of Texas for one term because her opponent completely screwed up his election. Bush was also riding the wave of change in the state that led to the craziness of Tom Delay and the current absurdities going on in our lege.
d) He didn't win the popular vote in his first election, and won his second election (barely) exploiting terrorism and gay marriage fears.
And yes I am Democrat, and yes I think W was a terrible president who thoroughly screwed up this country. I do not however think all Republicans are "stoopid". I do think the current crop of leaders such as Boehner and Cantor are not statesman or leaders like Bush Sr, James Baker, or going further back Eisenhower. But the Republican party has been hijacked by extremists, and GWB left our country in economic and foreign policy disasters. So yeah, I think he's an idiot.