Definitely the Garden of Eden. Absolute stupidity! I loved the character of Greta and thought she had great chemistry with Austin but that was the worst storyline ever. I felt sorry for both of the actors having to endure it!
The 2nd worst was Marlena the serial killer killing off half of Salem and then they all ended up alive in Melaswen (New Salem spelled backwards). I was so mad that they killed off all the greatest characters. I have to say I was glad they all came back but what a dumb storyline to begin with!