Some Barca fans already writing him off, how many games has he played? Ridiculous.
That would be, as always, a very small minority, and there's no point in arguing the views of those. I am sure there has been a minority of LFC fans who have been asking for Klopp's head, too. It is really pointless to discuss such things here.
My own feeling is that Barca didn't need Coutinho, not at that price anyway. I just refuse to believe that Barca academy (or other academies in Spain) stopped producing good midfielders. Strikers and defenders tend to be hit or miss, but Barca academy and Spanish youth teams are littered with brilliant young talent. I cannot justify Coutinho's price tag, and I think nobody can, unless he comes in and stamps his authority and decides games. Has he done that so far? No. Will he do that? Remains to be seen.
Somewhat related to this, we have also heard a lot about Griezmann to Barca rumors. If that happens, Barca attack and midfield will have Busquets, Iniesta, Rakitic, Coutinho, Dembele, Griezmann, Suarez and Messi. How do these all start? I have no clue, but all of these would expect to start. Again, this makes me think that the Coutinho transfer was unnecessary as Barca could have lined up with Messi as the attacking midfielder:
------------------Busquets
-----------Messi-----------Iniesta
Dembele------------------------Griezmann
--------------Suarez