Back off, Blair Haters!!
I actually think that Blair is a role model.
That's right, a Role Model. Critics and parents say that Blair is unrealistic because she is rich and able to drink underage, beautiful and vindictive but she is also very realistic and has that quality that is so valued in a Christian: the internal struggle for redemption. Blair is initially a bitch to Serena and Jenny but she redeems herself at the end of season two when she fights Georgia.
In fact, Serena has her own redemption story. The tv show begins with Serena reformed into a good girl, but she is escaping a past that includes sleeping with her best friend's boyfriend.
This is therefore a much more Christian themed show than parents give it credit for. And Blair is not a bitch, she rox.