I can see why some Juve fans dislike him. Our brand of football is painful to the eye.
But it's very hard to argue that Allegri is getting the best out of his team. And those who criticize him seem to forget that Allegri inherited a team full of weak, weak-minded, young and injured players.
Anyway, if we exclude the post-Ronaldo shock when it was close to impossible to fix the team right away, result-wise we are doing pretty well. After the disastrous 4 opening rounds, we actually won the most points in the league:
Juventus 51 points (24 matches)
Milan 50 (24)
Inter 48 (23)
Napoli 45 (24)
Atalanta 40 (23)
Lazio 39 (24)
Roma 38 (24)
.
.
In CL we have a solid chance to make it to the quarters, we're very close to a Coppa final, and if it wasn't for that Sandro brainfart in the 120th minute, we'd have been a penalty shoot-out away from winning the Supercoppa in Milano. Yes, all this was done in the ugliest way possible, but with our team, and our injuries, I really don't see any other way how to do what Allegri managed to do.