I don't think it was that great an idea to take Joanie and Chachi away from Happy Days for their own show because their romance became such an integral part of the show, especially in the post-Ron Howard era. But the big mistake was taking away the spinoff from the time slot right after Happy Days onto its own night. Then Joanie Loves Chachi faded into oblivion, and Joanie and Chachi (Erin Moran and Scott Baio) returned to the mother ship for what turned out to be its last season, and the two lovebirds married in the final episode.
Catch Joanie Loves Chachi on TV Land or one of those cable channels and enjoy the few episodes. And be warned, Scott Baio is NO singer. The poor boy can't carry a note! Erin Moran is no Karen Carpenter or Sarah Brightman, but she has a sweet voice. The theme song is nice, and with Moran singing with Baio, it's only half bad (Baio's half).
Maybe this spinoff didn't achieve the success of Laverne and Shirley, or Mork and Mindy, but it's still worth checking out if you're a Happy Days fan. (And who isn't? :))
