I grew up with this song on the radio. I really wasn’t listening to it very carefully.
Then it turned up in “The Big Chill,” and – ooh! – everybody thought it was great.
Then the song died into oblivion again.
Listen to it. It’s the percussion that does it. That compulsive drumbeat (which is perfect for the whole “grapevine” idea). And those raspy lyrics. It’s a wonderful end-of-relationship song.