It's not about winning big. We've won big home games with Ernie too, it's bound to do it when we meat small teams at home. It's how we do it. We're gonna win with some golazos from our star players (Messi, Griezmann) like we've been doing it with Valverde, or we will win tiki-taka style like in our best days of positional game.
I am for one going to look at this game from a purely tactical perspective, to see some differences. Midfield dynamics is where there is most room to grow, as this part has been crap under Valverde. That and fullback roles should improve.
Serghei,I think you are a little bit too optimistic about Setien's short term impact on the team's tactics and performance. Even the best coach in the world cannot implement his ideas in just a few days,especially in the middle of the season and especially when a big proportion of the players may not be willing to change their game easily.
Here in my country(Greece),it is REALLY common to change the coach midseason(sometimes the teams end up with 3 different coaches throughout the season),so we have seen how things usually go(most of the times,the team performs roughly as bad as before or just a little better.It is also common to see a short-term boost,just because of the psychological "shock").
This phenomenon rarely happens in Europe's top teams.You may say that Setien and Barca's players have a far superior tactical understanding of the game than the coaches and players in Greece,which is of course true(though many Spanish coaches of Setien's stature and accolades have worked in Greece to be honest),however the basic idea still stands.
In other words,you can't expect of Setien to change Barca overnight.Beating the likes of Granada in Camp Nou playing relatively beautiful football is nothing special...EV,Tata and Roura have also done it.
We should see how and if he can change the team tactically and urge the players to try more in 4-5 weeks time IMO.