Well, as I've stated elsewhere, I don't hate her, but I don't think she's a good candidate. Is she too unlikeable to be elected -- I think my answer to that would be "yes." Is she too polarizing to be elected, my answer would be "maybe." There are those on the right who have the visceral hatred of Hillary Clinton described above. I'm not one of them, although I admit I pretty much had that kind of visceral reaction to her husband. Hillary has, however, has disadvantages of her own as a candidate, and her general lack of being likeable is a big one.
This is lost to time, except for historians and other deviants like myself. Thomas E. Dewey was a shoo-in to win the 1948 presidential election. He was favored in all the polls. Harry S. Truman, the Democrat and incumbent, had poll rating as low as George W. Bush's, and was facing a challenge from the "Dixiecrats" who didn't favor his beginning steps toward integration. There was no way the incumbent would be returned to office.
And then the worm turned. Dewey, apparently a firey orator in the courtroom, came off as cold and distant in public. An accident in which he was jolted by an errant train movement while speaking from the back of a rail car led him to say the engineer should be "shot at dawn" -- he came off as unsympathetic.
Truman, not a great orator but great with people, went on his famous whistle stop tour. He won the public over as a "popular populist" (not as common a political animal as one would think). The result is the famous photo of Truman standing on a rail car holding a big Chicago Tribune newspaper with the headline saying "DEWEY DEFEATS TRUMAN" after the results were in showing that Truman had defeated Dewey. Likeablity counts.