Barcelona is a mediocre club after Messi left, there's no chance anymore for Barcelona to win either Champions League or Europa League, the best they can get is domestic league or cheese burger league. Barcelona need to sell their club to rich owner first, then they can rebuilt their club and able to compete with the top clubs.
Barcelona need to be happy if they didn't get eliminated in the quarter final match.
It is the truth. Barcelona were always building their game focused on Messi. Since he left the team Barcelona have been trying to renovate the squad to try new things. Have they been successful at doing it? I can't talk positively about that. Because they were terrible in the Champions League for 2 years straight for example.

This season they might look like they have made progress but their group was just too easy for them. Now they will probably eliminate Napoli too but Napoli are also far away from their look in the last season.
Xavi is also leaving the team because of getting worse this season. Especially in terms of defending, they are just too bad.

Maybe I can't consider Barcelona as a mediocre club. Because in my opinion Barcelona's performance is still slightly above mediocre clubs. Because even mediocre clubs will find it difficult to win the title in their domestic league. But Barcelona succeeded last season. But if we talk about UCL, I also think that Barcelona has a small chance. Even if Barcelona manages to qualify for the next stage, maybe they will be immediately eliminated in the quarter-finals. But if Barcelona is able to progress further then it will make us start thinking positively about this club again.
Barcelona's problem is that their financial condition has not improved in the last few seasons. And this must be addressed immediately if this team wants to be successful again.
Xavi will leave at the end of this season apparently for the reasons we expected. That is, the situation at this club is increasingly not easy.