Hmm. I haven't seen all of season 2 yet, so I'll pick from S1. And yet... looking at the episode list, the only one I have any negative feelings for is Crush. The Lex/Pamela stuff is wonderful, but it always bothers me how they toss Whitney's dad's funeral in at the end. That scene deserves a much stronger episode, imo. Of course, I'm very spoiled by the Jossverse where all the scenes in an episode fit together thematically. I think that's made me a little lazy. If the theme's not artfully executed or pounding me over the head with symbolism, I tend to miss it completely. And then I'll go read some brilliant meta and feel like a dork because I was just drooling over The Sexy when there actually was interesting stuff going on.