When did "Smallville" jump the shark?
I recently purchased Season 5 (I stopped watching the show as it aired sometime back in Season 3, and have caught episodes in other forms since then) and I guess I'm a third of the way through or so. After episodes on vampire sororities and infiltrating strip clubs, it's become abundantly clear that the show is floundering, and probably should have ended before our intrepid heroes left high school.
But at what point did the show make its biggest misstep? I mean, the first season was pretty rough to begin with (what with the freak-of-the-week episode structure), but it seemed to hit a nice stride in the second and third seasons. What was the turning point?
Flipping through the booklet for the Season 4 set, I'm seeing loads of possibilities...