I'm not even defending Motta. Guintoli created this mess and we keep buying some silly players. We are Long term fucked.
For me it is the other way around to be honest. I blame Motta more than Giuntoli. We must admit that Giuntoli did get some good deals/players, as well as some good sells. Motta wanted Koop, Toli delivered, Motta wanted Nico, Toli delivered. Motta even wanted to keep Soule, turns out Toli was right to ship his ass and get 30m.
The only downsides of the summer mercato were:
no backup striker, but the Milik's injury also affected this
no RB
selling Huijsen, but to be fair no one expected him to be this good after that shit cameo in Roma
unable to offload Arthur.
But there is no way he could "fix" all in one window. Lets not kid ourselves, we were all fapping on the team and the coach just before the season started. It is not Giuntoli's fault that the best midfield of Seria A last year is flopping in this team. Now though, I dont like Giuntoli's work too. The Danilo situation, the Veiga expensive loan without option, as well as the random RB kid from Portugal are undervelming to say the least.
Bottom line, for me at the moment Motta is the biggest flop, even more so than Koop and Luiz.