Is she weaker than Romney?
Oh yes. She is weaker than Mondale even.
She is so weak as a candidate, I can’t think of a single major-party candidate in the history of the United States who was weaker.
Against a Trump, she's weak. Her "strength" is that she enjoyed insulation from attacks by vicious counter-attacking which cowed the enemy into submission lest he be deemed racist/sexist/homophobic/etc. Trump won't back down and will peel off her facade like a bad case of sunburn.
Romney was weak because he wouldn't fight - if he had fought half as hard against Obama as he has tried against Trump, he may have squeaked out the win - evidently he didn't consider Obama such a bad guy.....
Romney wasn't that weak until debate two and afterward. Somebody got to him.