Not much.
She saw films as trashy fun. She was more of a reviewer than critic.
Her avowed mission was to save film from being conceived of as art. She was fiercely and proudly anti-intellectual (which accounts for her popularity in certain circle). Whenever a filmmaker she championed started getting too much serious regard, she turned on him -- Altman, Scorsese, Coppola, DePalma to cite just four examples.
She was also thoroughly anti-auteurist. She just saw movies once and said that is all anyone ever needed to see a movie to know all about it.
The lack of rigour in her writing is appalling.
Brian