Now that Barcelona have finished the deal with Aubameyang successfully, the exciting process has started for Barcelona. They would probably hope him to get accustomed to the team as quick as possible. Aubameyang can be a big goal source for them. Barcelona have had really serious problems about scoring so far. They have scored only 32 goals in 21 matches. This is not even equal to two goals per match. They need to make this statistics better to be able to fight for the upper positions in the standings easier. And I hope they can with the help of Aubameyang.
Aubameyang will be excited to join Barcelona and Barcelona will be happy to recieve him. Aubameyang did not shine very well in England clubs. I will not rare Aubameyang as a super star but he is a good player. When you say Barcelona has played 21 matches and score 32 goals. It is not poor with current Barcelona.
Unless you are talking about Barcelona of Messi, Neymar and Suarez. Those days are gone and it will take Barcelona time to get it back.