As concepts, midichlorians are infinitely worse than a wookiee Life Day.
But the Holiday Special simply isn't watchable. My local library had a VHS of it to loan (weird, I know) and I excitedly brought it home and I literally couldn't watch for more than about 10-15 minutes. Feeling anger about midichlorians is better than intense boredom.
I actually was reminded of the Holiday Special today as I stumbled across "Legends of the Superheroes" for the first time today and imagined it would be in the same painfully boring style (it's actually pretty funny).