Very uneven, underwhelming

I like some dark comedies but this felt too awkward and unrestrained between being dark for dark's sake and goofy for goofiness's sake. I rewatched it yesterday after initially watching it in 2008 and, knowing the twists, I liked it less but gave it a slightly higher score.

The Good
A lot of the supporting cast was pretty good.
The lines "I don't want to ever catch you being a racist", the father insisting that he wasn't ignorant and "You can use [racial slurs] at any other time" out of school were funny, some of the few relatively realistic ones.
Some of the ambiguity about Mr. Anderson was interesting.

The Mixed
The father complaining that feminists always blame the parents was interesting, it seems that, as bad a character as he was, he was right that some children could be evil on their own and yet the film suggests he might actually be the cause of it, too ambiguous on a key point.

The Bad
Kimberly felt a little too villainous and untrustworthy/scheming and even unbelievable from the beginning. Basically hating blondes and yet having a blonde best friend and, at least on rewatch, it being clear that she resents the friend dating the ex. Her anti-Semitic comment made me think she didn't care at all about Anne Frank.
The father was too overplayed like saying No swearing after he had been and claiming to be working when he wasn't (implying that he really almost never worked, makes him too much of a strawman).
The reporter flirting with or kissing her assistant so often and in public felt too salacious and dumb.
The reporter seemed to have sincere sympathy for victims of sexual assault and yet had sex with a child; I guess that's OK hypocrisy in a character but it sure could have been better (like if the relationship with Kimberly wasn't played so much as sexy and for laughs). Kimberly's last line, suggesting that using her looks was comparable to using a person, felt pretty cheap.
Mr. Anderson shutting the blinds in his office feels cheaply deceptive, not much of a reason to do that and he should have known it would look suspicious.
Kimberly wanting to be discredited-too wacky-someone as smart as she seemed to be should know that infamy is less advantageous than sympathetic fame.
The ending-? A lot of viewers seem to think Kimberly started to feel bad because she saw herself as similar to the school shooter but she initially had said that she partly knew how he felt and admiringly called him Rambo.