You're annoyed, just like Allegri is. The results simply don't leave space for critic.
But the average Juve fan wants one thing, which 2 years ago seemed like a logical next step for Juve: to be considered a CL favorite, just like Real, Barca and Bayern are favorites every year. Of course, the ultimate prize will be the CL trophy, but that will come eventually if Juve are so strong to always be one of the top 3 favorites.
What makes the fans so disappointed and even angry, is the fact that this Juve does not give an impression of a team that is gonna achieve what fans expected to happen after that CL final. And this is the reason for the critics.
You'll be right to say that it's too early and patience is needed. After all, the results are there. But as much as the critics are undeserved due to the results, they are very rational from a Juve fan's point of view. It's the fear of failure and unfulfilled expectations.
The point is that most of the nonsense lately on this forum, calling for Allegri to be fired, calling our performances disgraceful, calling our mentality disastrous and pathetic, our players utter shit.... this is beyond the pale. It's absurd and farcical.
After each win in the league against minnows, it's all about how we'll eventually lose if we keep up such "shitty" performances, and that we can't hope to succeed against better teams playing like this. First we going to lose to Napoli because our performances our so bad, when we won, it was "undeserved" and a "terrible" performance. Then it was how we didn't have a hope in hell against Sevilla because we are playing so poorly. And now that we beat them 3-1 it was another "disastrous" performance where we apparently fluked the win because the ref was biased for us.
No one stops to think that maybe we play a style that works, which frustrates our opponents endlessly. Sevilla had 1 good chance on our goal in 180 minutes. From a corner. They scored it. All the same, 1 single chance in 180 minutes. We play in a way that gives very little in the way of chances to our opponents, while always creating a number of chances ourselves, even though this number is too few to make us an "entertaining" and "attacking" spectacle, and to allow us fans to sit comfortably through games. It's often frustrating to watch, as many of our spectacular players seem quite neutered at times with how we play.... but all the same, it is highly effective in the vast majority of games.
We've also seen against both Real Madrid and Bayern Munich the last couple years (to a lesser extent ManCity), that when we are faced with top sides and can't afford to play such a style, Allegri modifies his tactics, in general, very successfully. We haven't seen it this year, because we haven't really needed it. Instead, we've choked the life out of our opponents all season long, while creating just enough in attack to win. It's frustrating and doesn't look pretty. But it's certainly good enough to beat anyone but Real, Barca, Bayern, Atletico. Against them, I highly doubt we'd see this same sort of play.