You don't hear it very often on the radio, but it's a really good song.  Tom Petty has one of those odd type of voices that is refreshing.  You know he'll sound pretty much the same live as he does after all the mixing and remastering is done which you can't say for others.  This particular song just has a power in the lyrics about a guy in a bad romantic situation that really resonates with anyone who has ever been in love with someone else and not had those feelings returned by that person.