Juve fan here.
He has the talent only few players in the world might have. At his best he is easily top 10 player in the world.
He has been a number 9 in every club he has played until he got here and Allegri started to play him with each season further and further away from goal, because of our poor midfield, he drops back and helps the build up more than getting ball at further end to convert them. It's like playing Aguero as a midfield and call him overrated because he can't operates like before.
At his first season Max took him one step away from goal and played him in SS position. The kid did an amazing job and became our best goal scorer and best player of the year for us with scoring around 25 goals despite us losing Pirlo, Vidal and Marchisio being injured all season.
In his second season the lack of creative MF and us selling the our only creative player to Manchester United , Allegri took this guy one more step away from goal to compensate the lack of creativeness. He became a number 10 in 4231 formation in that season and again he absolutely dominated teams with scoring goals and creating for fun. We went all the way and were 45 minutes away from winning a treble with this guy being the core of the team.
The next season after he continued his great form and scored about 15 goals in 13 games at the beginning of the season until got injured for 3 months and when he came back he was rusty but manged to win us the Scudeto with his last minutes Goals And assists against teams like Lazio, Inter and...
Finally this season started, we brought the best player in the world, this season was the one Allegri completely rekt everything with his systems selection of his players. First of all he ditched 4231 while we have Ronaldo, Costa, Bernardeschi , Cuadrado and Cancelo as wingers an played some stupid formations that let Dybala plays in some sort of position between the right fullback and CM. He made Dybala a midfielder this time and expected him to deliver once again. But this boy isn't a robot his form dropped massively and got benched or played in midfield all season long. The only time Allegri played him as a number 9 this season was against Manchester and in both game he was fantastic, but he got benched the next game after Mandzukic came back from injury and never played there again.
His drop of form is completely on the coach. He is the guy i won't even like to see news about his departure. I'm sure with the new coach coming in he wouldn't let this gem to be sold and make him flourish again.