I would definitley say that there are plenty of factors outside of intelligence or lack thereof that would make Palin a bad President.
For one, most of the world sees her as an idiot, and not a particularly likable one- if we want to get back into the good graces of the international community she's probably not the best choice for that.
Another reason that she would probably suck as president? She may have some exectutive experience, but it is in a state that doesn't even IDENTIFY with the rest of the US most of the time and doesn't put a high amount of emphasis on the executive roles of the state government.
Mrs. Palin herself doesn't beleive in the public education system, so I'd certainly hate to see what she would do with our public schools
Her role in women's health issues is also rather grim... I wouldn't look forward to trying to find Plan B or even particularly a variety of birth control options if she has much say in anything :horor:
Just some thoughts to broaden the debate a bit more