Because IMDB doesn't want it there. They shut down the message boards. Sure, the reviews are still there if you want to say something in general. But they aren'

Because IMDB doesn't want it there. They shut down the message boards. Sure, the reviews are still there if you want to say something in general. But they aren't good if you want to talk about a particular scene, character, or line. Or interact with something another person said.