You know what, even I've grown weary of defending Meg Griffin. After seeing the reruns of Family Guy on Adult Swim these past few nights, I've come to the conlusion that you guys are right: Meg is a lame, uninteresting character. She's the Zeppo Marx of the Griffin family and the time to have "fixed" her character has long since past. The time to done something to improve Meg's role on FG was before the series was un-canceled.
The only solution that I see for the Meg situation now is to simply remove Meg from the show and replace her with a cute, interesting, funny teenage duaghter character.