Were the writers in love with Kristin Kreuk?
As some think, but some have pointed out on the audio commentaries where they say how she's the magic of the show etc, perhaps they shouldn't have said that because it's like if you have written a OK protagonist and saying he or she is the show stealer it's one thing coming from audiences or critics but coming from the writers themselves it's inducing eye rolls. Lana was not the magic of the show she was a three season love interest who overstayed her welcome, they played up her role too much as a result it ruined the character in people's minds, her constant bragging about secrets made her come off as unsympathetic and also the concept of the love interest not knowing the hero's identity through out has had it's day by the time of the show, but the writers were so obsessed with KK/Lana and secrets they just decided to ignore it and it didn't help that Lana's role as Clark's boyhood friend was taken up with Chloe.