I had never seen HAIR the original stage musical but I was in love with the score by the time the movie came out in '79. While I liked a lot of it, I found stitching it to a literal story kind of weighed it down. And the satirical bits were pretty heavyhanded. I spent a lot of the time watching the movie looking for my friends who were extras in the opening and Be-In scenes (they don't show up.)
When the movie began playing on cable, I watched it incessantly. I was obsessed with it. I wanted to be a hippie. But like any other obsession, it eventually wore off after a while...
I didn't get a chance to see the recent B'way revival, but the tour is coming to Philly this year (it's also back on B'way this summer, so who knows?)