This episode, is just as good as all classic era Simpsons, the voice acting is superb, the animation is great, the plot is good...until it comes to the end where Lisa learns...well what does she learn? Nothing! She steals Bart's lines and jokes and Marge won't let Bart put an end it to it. She lies to her new friends constantly about everything and when Bart rightfully calls her out on it by showing her friends the year book they don't care and after Lisa threaterns Bart (violently) it turns out they still want to be her friend.
In the end the story makes bart "apoligise" by giving Lisa her year book signed by her new "friends". So the story acts as though Bart is the bad guy despite the fact he did nothing wrong and Lisa is the one in the wrong constantly throughout the story.
I wouldn't rate this episode so harshly if not for the glowing praise it recieves from everyone else I ever interact with. This in my view a glowing example of insufferable Lisa.