I think the reason why people will keep complaining until things get right in the club is because during the club world cup where they were humiliated by the boys Chelsea dealth with is because, we saw reoccurring lapses, their defense was not good, the midfield was messed up talk more of the finishing, so support any person complaining because it will serves as an opener to the manager that all is not well with the club as such he should be prepared from now to lead to the team on a successful journey, Realmadrid is not just an ordinary team, so it should come as a surprise when you see or hear fans complain a lot, yea i agree that he is supposed not to be judge immediately but in due time, don't also forget that he's the manager of the club, so things will continue hitting up on him.

However, Xabi has just led the team. He doesn't have much time before the FIFA Club World Cup competition at that time. Xabi does have players with good quality, but the players also need time to adapt to the change in system and strategy from the previous coach to the training patterns implemented by Xabi.
Yes, he is new and will always be highlighted for his performance. If there is a decline or his performance is not as expected, criticism will definitely come. He and the club certainly have targets to achieve. So let's just wait and see how it develops for the new season.