Premier League is difficult for new comers and even Nunez has a big transfer, I think we and Liverpool should give him one first season as a preparation for him. Don't judge about his quality in hks first season there. Give him peace and less pressure as possible. We will see best Nunez in Premier League.
Even so, I think the same goes for other expensive players like Haaland at Manchester City. The first season was difficult to judge players and it is true that we have to give them time to prove their quality and productivity. For Nunez and Haaland I don't think they will take long to prove their quality, so maybe their adaptation in new team will be fine and as strikers they can also be expected to score more than 10 goals in first season.
Against Leipzig, Nunez appeared extraordinary. The 4 goals he scored in the second half proved that he deserves Liverpool's attention this season. I'm sure Nunez will be very dangerous as a striker, he has to get close guard from the defenders if he doesn't want their team to lose.