I do agree with you to some extent.
Now, im not asking Allegri to come up with a brand new formation. However, it is disappointing to see him line up a 3-5-2 which is a formation very much build around a playmaker of some sort. Basically, he made Padoin that focal point. That is inexcusable to me. Im definitely not claming I have more knowlegde than Allegri, but even a brainless fool can predict a system built around Padoin will be a disaster.
if he would've played 4-3-1-2 with Pereyra as the AM, we would have been so much more dangerous on the counter. Pereyra is underrated, and he's different to Pirlo and Vidal. He has his own qualities different from theirs, he's not on their level but play to his strenghts and we have a phenomenal player. Thats the point, play to these players' strenghts. It should've been a no-brainer for a manager coming off a UCL finale. But he's a smart guy, and he'll bounce back.