It is unclear whether Brentford is not in their best form or Liverpool is simply too strong for them but what is certain is that Liverpool played impressively and they deserved the win. It is quite difficult to compare the strengths between teams because the season has only just started and I think there are still some teams that haven't yet set up. However, the match against Man United seems to be able to be used as a comparison, whether Liverpool with their new coach and strategy is truly effective or whether Man United is the one who stands out with all the changes they have made.
So far Liverpool have not met a strong opponent so it is true that we cannot conclude anything about Liverpool's strength with their new coach but as far as I see right now there is not much difference from Liverpool's team performance moreover the players in their current squad are still the same as last season. And for the victory against Brentford in the second week it is quite worthy for Liverpool to get, that's because Brentford is not better in quality than Liverpool.
Their former coach Klopp was built Liverpool to the point that any coach can coach them and they will still be win many matches than the ones they will lose because they are used to Klopp game pattern and it has sink into them.
When we will see the quality of their new coach is when they will meet a strong club and the challenge and pressure on the pitch is very tensed for them, that is when his experience and game strategy will prevail. Liverpool is doing well and started the season with consistency as normal and I believe that they will go far.