Even ignoring my new-found passion for Austen (yes, I'm one of those) and the fact that I had just finished reading P&P literally days before viewing this version of it, I find it hard to believe that so many reviewers find anything of value in this unfortunate production - clearly stamped out on the MGM studio factory line, with little care or thought, like so many of the films of the period. Fortunately, my love of the novel, and of the superior Ehle/Firth version, allowed me to dismiss this with very little pain.
With that said, though, I still must comment on one thing that really seemed to miss the mark, and that I don't see mentioned elsewhere, and that was the way the Bennet sisters were presented. They ALL seemed like silly little girls and, although Garson's Elizabeth had an opportunity to demonstrate how "modern" her thinking was, she still came off as comical, not to be taken seriously. Austen made a very clear distinction in her work, between Lizzy and Jane on the one hand (intelligent, reflective, serious and sensitive) and their 3 younger sisters (flighty, man-hungry, vacuous), and that difference provided a potent (frequently humourous) backdrop to the character development and plot in her work. This version didn't even come close to presenting such a distinction.
Others' comments take care of the rest of my objections to this drivel, so I won't repeat them here. But I will add that even Olivier couldn't save it for me. He seemed the same person throughout the entire movie. Charming, yes, but did he show any sign of having accomplished the transformation that Elizabeth helps bring about in him in the real story? Did he learn anything about himself in the course of his relationship with her - other than her superior skill at archery (which, in its attempt to show her to be full of surprises and quite capable of upsetting Darcy's composure, only added to all the silliness).
The novel helps us understand how bright, intelligent and introspective individuals can accept their limitations, change their way of thinking about others and themselves and grow tremendously in the process. This MGM outing was more like an Andy Hardy movie with pretty costumes and a faux British setting.