I actually saw the Holiday Special live in 1978, and even as a 6 year old kid I thought it was horrendous and forgettable.
The Prequels atleast had SOME memorable moments, but were just overall bad movies. The Holiday Special is awful from the minute it starts. I bought a copy on ebay a few years ago, just to see it again 30 years later, and good lord it was just as bad as I remembered.
It still should be out on DVD or BluRay, simply because it is a part of SW history, and everyone should see it once.