This episode should not have been just another Brian and Stewie adventure. What I didn't get is if Stewie hates Meg so much, then why did he want to save her from those people in France who kidnapped her in the first place?

Why didn't The Griffins ask Joe and Quagmire to help them? Quagmire is a pilot. Why didn't he do anything? It would've been better if Peter, Lois, Quagmire, Joe, Chris, Brian, and Stewie all have went to France. You would think Joe with his police skills would've been able to track the kidnappers down, and Brian and Stewie could've helped Joe with that. Peter could've had funny ideas to save Meg. Maybe Lois's rich father Carter could've had a private jet that Quagmire could've flown to France, and they all could've gone to save Meg.

Why didn't that happen?

dude ITS A TV SHOW

This episode should not have been just another Brian and Stewie adventure. What I didn't get is if Stewie hates Meg so much, then why did he want to save her from those people in France who kidnapped her in the first place?

Why didn't The Griffins ask Joe and Quagmire to help them? Quagmire is a pilot. Why didn't he do anything? It would've been better if Peter, Lois, Quagmire, Joe, Chris, Brian, and Stewie all have went to France. You would think Joe with his police skills would've been able to track the kidnappers down, and Brian and Stewie could've helped Joe with that. Peter could've had funny ideas to save Meg. Maybe Lois's rich father Carter could've had a private jet that Quagmire could've flown to France, and they all could've gone to save Meg.

Why didn't that happen?
Your suggestion is great and I rather had seen that than just Brian and Stewie.