Honestly, midichlorians are worse. They attempt to justify scientifically what should only be taken as is. As for Life Day, I think a day of celebration is natural to any developing species; once the species develops that to be thankful for, it normally has some happiness, which could lead to celebration. Of course, showing it was completely unnecessary, and, having watched the Holiday Special only once, I think that's how it should stay.
Puggo - Jar Jar's Yoda said:
Another related question... what's worse, "Jedi Rocks" or "Ode to Life Day"? That's not easy either.
Sorry but Jedi Rocks is better, not to say that any musical number should have been in ROTJ in the first place, but Carrie Fisher singing...