As Atalanta have qualified for the quarter finals of the Europa League, their performance is not so poor. Atalanta performed relatively well which allowed them to play against Liverpool in the quarter finals.
Atalanta are one of most attacking teams in Serie A recent years and their matches with Liverpool will be very interesting. I think both teams will score many goals in two quarter final matches as they are always obsessed with attacking.
Considering the current performance in the match between Atalanta and Liverpool, Liverpool must be put ahead. Liverpool will definitely be ahead and if no accident happens Liverpool will definitely win against this team and secure the semi-final. I am making this comment based on Liverpool's current performance. As they have been performing consistently in the Europa League and English Premier League, it will not be difficult for Liverpool to overcome the hurdle of the quarter finals.
Atalanta can not compare with Liverpool in quality as we can clearly see big difference between a team that is fighting for Premier League title and a team that is fighting for a position in top four of Serie A. Difference is big but in only two matches, Atalanta is a dangerous opponent for Liverpool.
It's clearly that Liverpool are stronger and have ability to beat Atalanta but they must play two quarter final matches with highest carefulness. Else Atalanta will force Liverpool to pay a high cost.