I also voted more based on "favorites" and "not-favotites" basis. I figure if they are my faves, the had to be good
My frustration with the series came in season 4 when Clark had more of an "edge" than Lois. I really really like the stronger edgier Lois of the 1st 3 seasons (and comics). The "softer" Lois really deteriated the balance of the LnC relationship for me. I found it tough tho to even vote for "worst" episodes, since I absolutely love the series (yes, even season 4)