We have shown that we can do okay against the likes of Lazio and Roma, which is the level of many teams that'll qualify out of groupstage, I'm not scared of those teams, we have good chances there.
But the Barca game was terrible, it was like those games against Bayern in Conte years or games against Real in Allegri years, we were hopeless. If our individual level is higher (we have the better players), I think that can compensate for the obvious weaknesses in Pirlos system, but that wont be the case against Barca and 5-6 other teams in Europe.