Using the AFL bidding system points to put some value to the trades;
Harley trade#4;
Gold Coast received Freo's Round 1 + Round 2 selections = #16 (1,067 points) + #35 (522 points) = 1579 points.
In return, Freo got Harley Bennell and Gold Coast's Round 2 pick = #22 (845 points)
That equals, 1579 - 845 = 734 points, equivalent to a 25 or 26 pick.
So Freo got Harley Bennell, the #2 2010 draft pick, with some baggage for the equivalent of a 25 or 26 pick.
Trade#37;
After that trade was completed, a little over a week later Freo traded (again with Gold Coast) their Round 3 pick, #56 (194 points) + their future 2016 Round 2 pick (value unknown) for pick #35 (522 points) and #61 (135 points). Freo then used those two picks to draft Balic and Yarran. (522+135-194=463). 463 points is about equal to pick#38.
So it could now be fair to say (in hindsight), Freo paid a premium in 2015 when trading their future Round 2 pick (given Freo's current poor performance and likely 20 something Round 2 pick in 2016), considering GC paid about 463points (pick#38) for it.
It would also be fair to criticise the recruiting considering all of those three recruited via the Gold Coast trades have resulted in injured players yet to play an AFL game.
Personally, I'm still optimistic that all three of those players will be good contributors for Freo in the future. If so, then it was successful trading. If not, then poor trading. With more time and hindsight, it'll be easier to applaud/criticise.