I don't think Bush is retarded, but I meet a dozen people each day who are smarter than he is.
He didn't get into office on his own merit. He was a drunk well into his middle age, before he found Jesus and sobered up. Then his pappy hooked him with a government job, since apparently private sector wasn't Dubya's thing (he ran a bunch of business into the ground).
Anyway, my impression of Dubya is that he is a pleasant guy. He seems friendly and personable, and doesn't take himself too seriously.
But boy did he make a shitty president.