I think people are entitled to. Not to go all Rafa but let's look at some facts here.
In 2012 we won the title. The next season we refused to invest at the same rate as our rivals. This was for an FFP that we failed anyway so brought no benefit. From that title win, it became clear that we were attempting to recreate the Barca model and the success that it brought and Mancini was not going to fit into that mold.
From 2012 to 2016 we were essentially in a holding pattern. We attempted to appoint people in key roles of the club that would work in a Pep based team. We attempted to purchase players who would play in a Pep team. We built a new Academy with all of the philosophies that Pep expected. We appointed managers that would lay foundations for Peps arrival.
Pep is one the best managers who has ever lived. His record speaks for itself and those who try to excuse it are ridiculous. But the club here was designed for him to walk in and elevate us. That hasn't happened.
Now it's fair to say that many things haven't gone to plan. FFP put a dent in our progress as did some puzzling decisions on not insisting on quotas for youth graduation. Pellegrini brought attacking mentality and started building a high line defensive system but couldn't implement it properly.
Pep was supposed to walk into a club setup for him. Instead he walked into a club with no youth promotion, a squad that was too important to sell but too aged to keep, and a system of play that required a major overhaul.
I'd argue if you build a club for the eventual appointment of that manager then that manager should not have to spend his first season implanting his core basic philosophies on it.
Pep came in with the biggest reputation in the game but has suffered the same problems as Pellegrini and Mancini before him. This club doesn't know it's a big club and doesn't act like one. It allows snail paced football from its team while those in the stands sit quietly. It allows the media and referees to dictate to us on their terms. They didn't even go after UEFA in the courts when they got screwed.
We've got the expectations of Barcelona yet the psychology of Barnsley. In almost ten years of the takeover that was designed to make us among the biggest in the world we've won two league titles and are still rolling around the same problems as we had under Hughes.
People are disappointed because we're becoming Arsenal like in writing off seasons after season.
I've no doubt that Pep will get it right because I see the changes he's making to how we play but he has not been the revolution that many including me expected because the club was not and is still not in a place where he can take it forward.