Even as a "liberal", I believe that Ford served with distinction. He had that singular role, as you said marillion, of being a placeholder: of completing the term, transitioning back to normalcy, as it were, and healing the nation. It's hard to imagine anyone doing it better, and very easy to imagine someone doing it worse. Nixon's reputation has never and will never benefit from his being pardoned by Ford. There was no way that whatever Ford decided to do on that score was going to please everybody equally, no matter what he decided. The fact that the country was able to move on in relative tranquility is a testament to Ford's leadership.
It's also a testament to him that the 1976 election was as close as it was. Ohio was decided by 11,000 votes out of over 4 million. If he had won OH along with an 18,000 vote swing in WI (another close state), he would've been elected in his own right.