Everything depends on expectations. Now Barcelona is not the club that can get Mbappe or Lewandowski. So even if a "regular" player like Aubameyang just does his job well and scores goals, it will be a great state of affairs for Barcelona. At the moment, everyone is comparing Barcelona purchases with the past, but those days are gone, everyone needs to lower the bar of expectations and then there will be no disappointments.
Regardless, Barcelona's new-look attack looks promising, even if it does not have a single star player. None of the players are world-class; they're all average. We know what their boundaries are, so they didn't sign anything good. As a result, I worried whether or not they would be sharp on the field. While they look good, I don't think they're going to beat the Barcelona of 2004. However, I wish they would get back on track again very soon.
If by returning to the track you mean returning Barcelona to the ranks of the top clubs, then I think you will be disappointed - this will definitely not happen with this line-up. These are good players for certain tasks, but they have their own ceiling.
Aubameyang is a very good striker, but only 4 goals scored for Arsenal is not the best indicator. He joined Barcelona as a free agent, so it's a good deal for Barcelona. And perhaps Aubameyang himself feels that his place is not in England, because a striker with such performance indicators definitely needs to change something. He is capable of so much more.
In La Liga, he will have more opportunities to improve his statistics than in the tough EPL, that's for sure. It's a good deal for both sides, with Aubameyang getting some career progression and Barcelona a solid player on a free transfer.