I would say that Real Madrid's performance last season was terrible because they were barely able to win any other title apart from the Copa Del Rey. Real Madrid failed in La Liga, they failed in the Spanish Super Cup, they also failed in the Champions League and it was a big blow for a team that was the favorite last season.
Since their poor performance from last season, the club has made changes to the team, and they are in a better shape right now than the shape they were in. They have signed new players that are very talented and made adjustments to the team from last season. They will have a good test against Manchester United, that have equally developed a lot from last season's game. Eik Ten Hag said that Manchester United do not play friendly games, so Real Madrid should be ready for tough game from the English team.
Real madrid performance in last season was very terrible that small teams were able to defeat them several times in the season. Real Madrid struggled both in Premier league and in Champions league, but this season Real Madrid have brought some players that will be really good in performance, the bad performance of Real Madrid last season is something they would not want to allow to repeat again this season. The Champions league has always been a target to Real Madrid which they really need to win it this season.