She is a great public speaker, which is hugely important.
But she just didn't have the knowledge base to run the country.
I have said it before, but it's on point, so I'll risk being repetitive.
She should not have been asked to take the Veep slot. She most certainly was right in choosing NOT to seek the Presidency this time around. What she SHOULD have done was take a year off to just read, read, read, read and then read some more. For example, ALL back issues (going back to the end of the Cold War, at least) of
U.S. News and World Report up to the present day. Really digest it all. Then, go ahead and look at the
NY Times. Yeah. It is biased, but there's still a decent amount of information you can glean from it.
I bet the members of this Board could compose a list of reading material (The Economist, The NY Times, US News and World Report, a few rocking science journals, a couple of good solid world history books, etc) and getting herself immersed in that could be a good full time job for her for a while. My hunch is that she actually is smart enough to put it all to good use.
Then, but only then, would it make sense for her to combine her political instincts, her speech-making ability and her newly acquired base of knowledge to take a real run at the Presidency.