Martinez and Motta were poor signings, but great directors of the past have all made mistakes. You put down Pepe as a poor signing, though? Can't say I agree with that. He was incredibly important for us in winning the 2012-scudetto. That he sustained a long-term injury 2 seasons after being signed isn't Beppe's fault.
Pepe has been a good signing, he was very important last season and overall he was average in the first. Sure we overpaid, but I really think that we were struggling to attract players at that time.
As for Martinez, I would probably say that was the worst transfer that I have seen in the 19 years that I have supported Juventus.
I think Marotta has done a very good job, especially when you look back to see where we were when he came in. The guy clearly has a strict budget to work with and that has harmed his ability to get a top striker player in before this season.
The signings of Vidal, Pogba, Pirlo, Lichsteiner, Barzagli have been outstanding.
My main criticism has been the ability to sell, although I think the contracts offered by Secco has also played a part.