First Debate- Arguably the clearest cut win for her. She seemed informed, meanwhile Trump was borderline incoherent.
Second Debate- Technically a Hillary debate win, but definitely the most narrow and I think it could have been WAY worse for Trump, considering pussygate was very much in the news. In fact, now that I look back, Hillary really only won the debate due to her decimation of Trump on that issue.
Third- Still a Hillary win, but narrower
Hillary did not win the 2nd debate. That is insane.
According to the metric I am using, polls, she appeared to have a slight edge, but admittedly it was practically a coin toss, and I could see a very strong argument saying that it actually helped Trump just because of the expectations game (he was expected to be abysmal, particularly after Pussygate.