What makes you think that Carlton got a horrible deal?
I am only assuming that you think Brock is not going to play more than 50+ games for the blues?
I fail to see how trading away pick 11 for a quality inside midfielder is getting ripped off, especially considering that he is only 23 years old. There is potentially 7 years of AFL ahead for Brock and he has shown his potential at AFL level.
Think about what the Pies paid for a ruckman just a couple of years ago, in a "stronger" draft.
50+ games, a quality 1st round selection could play 200+ games
lets be honest it's been some time since Brock has had a quality full season
I hope he goes well however IMO his body is very suspect and struggles with leg speed for the modern game