there's a lot of reasons that hillary would have been better than obama. health care. queer issues. kids. women. unions. obama's been decidedly right of centre on issue after issue. hillary would not have been.
however, if your issue is war, she might be even worse. she's spent the last four years proving that, to a number of people she needed to prove it to.
i expect her to run, and i expect her to lose because she's too left-wing. just like in 2008.
http://www.theatlantic.com/politics/archive/2013/10/meet-the-new-hillary/280758/