We did overpay Fiorentina for him Jack. Ignore all the money Real Madrid is spending (even if you don't, with few millions more they got a player like Benzema for example), this is a very high transfer fee in my opinion. Remember how cheap we got Sissoko..
Fiorentina is starving for money, we could abuse that situation, we could include players in the deal. I don't know, 25 million Euros is a huge sum, almost equal Diego's transfer fee, you tell me honestly, are their worth's equal? Melo will become a bigger player with Juve, sure his worth will even rise, and no one dares to doubt his quality, but we, at least me saying that we could done better than that with Fiorentina. We just paid his transfer release fee, no skill there at all. But it's not a biggie anyway, just a small critic. But like I said before, if the board say that no money left for a leftback, and that we didn't sign one because of financial situation, then that's a huge mistake. But if you can afford money for both, then everything is great!