I agree, they aren't too good at sharing notes with each other. If I were working for Dharma, I would sure be learning as much as possible.
A couple of things make me believe they have learned a lot though. For one, Sawyer is in Security, in fact head of security. He said they were searching the island for their people in "grids." So this makes me believe that Saywer and company now have a pretty good layout of the island, they know where things are, all the Dharma stations, and what geographical features the island contains. Also, Farady is most likely (since we saw him in a past episode) working at The Orchid. He could have picked up on a lot of information there. Being in something for 3 years, you are going to pick up on a lot of stuff. I am sure they've been around to the other Dharma stations, maybe even The Flame and seen outside transmissions.