I know I'm a bit late to the party, but I won't pass up an opportunity to gripe.
Contact
-- I dislike this one partly because of Lois's hairdo and wardrobe. (The scarf! Ugh!) I suppose that's shallow, but she went from looking like a young, energetic woman to looking like my mom. Mostly, I dislike the episode because
why would Clark of all people not believe in aliens? He should be the
first person to believe Lois when she claims to be abducted by aliens.
Soul Mates
-- Mostly because I can't stand the idea of soul mates. The whole concept implies that our relationships are pre-determined and that we don't really have a say in how our lives play out.