Not at all. Everyone has evolved as a character. There is more internal conflict, and the characters are actually flawed.

Flawed isn't the same thing as deep. What do you mean by internal conflict?

Brian has really begun to question his own self-image in recent episodes...whether he's a good person, whether his atheism has gone too far, whether he's really smarter than the "idiots" he tries to oppose. He's a complex character. He craves recognition and affection, but in his pursuit for those things, he loses them. Peter does evil things. I said it. He has killed people, abused his children, and put his alcoholism and shenanigans before his family. That being said, he's not an evil person. He's completely ignorant to the pain and suffering he causes others because he's too stupid to comprehend what he does. Like Brian, he's a warm person at heart. Lois is another story. She's manipulative, cruel, and self-centered. She wasn't always this way, but her husband's increasing antics and escapades have driven her mad. She's truly the most dynamic character in the series. Everything has simply been too much for her, so she indulges in moment's pleasures (shoplifting, drugs) to keep her mind at ease. Stewie started as a Professor Fate kind of evil genius. Dastardly? Sure. Intricate? Of course. Evil? No. In the first couple of seasons, he was never shown actually killing anyone. The strange thing, however, is that the more "tame" and gay he became, the more evil he actually became. In the middle part of the series, he kills no less than four people onscreen. It's an interesting twist of personality and actions. Chris has become a truly tragic character. He's always been a lovable, harmless oaf ("I'm so hungry, I could ride a horse!") but bullying at his school and influence by his parents has turned him into a cruel, mean person. With Chris, we've actually seen his journey through high school: the friends he's made, the bullies he's made, the embarrassing things he's gone through. He's tried to stay positive, but in the recent seasons, it's been too much for him. Meg is the lamb. She's the lightning rod. Watch "Seahorse Seashell Party", and you'll see why she's truly the best character on the show.