Port have gotten more out of Burton and Duursma (who is young enough to be dating a high school girl) than we have Chad. I think it's quite reasonable for Hawthorn supporters to be frustrated by how this has gone so far.
Virtually every player that has been brought into Hawthorn has taken time to learn how we play. This includes stars like Burgoyne and McEvoy, who if I remember correctly underperformed in the immediate term and their trades were questioned.