Sorry for English teams in Champions League and Europa, it's all going bad for you guys. Now Liverpool have to score 3 goals, not impossible but I dunno, it's going to be very closed shop back in Bergamo 
If someone would tell me that Atalanta will win 3:0 at Anfield, I would call him crazy. One of biggest upsets this season. Ok, Liverpool didn't started with some main players, but in 2nd half even substitutions didn't helped.What also impressed me is such Bayer dominance against West Ham, just look at stats:
Biggest upset I think I read it's their biggest Anfield defeat ever, not sure if they meant in the Europe stage or at all time, I actually can't find any Anfield loss bigger than 3-0.
Also seems to be the first time this season they failed to score at home. Biggest upset to me, considering Atalanta have been one of the shittest teams in Serie A lately.
But you know what? People forgot this Liverpool team is not so good. Especially the keeper, people forgot when they had to let go of their Champions League keeper Karius. Eventually, weakness is exposed. They mainly survived without Alisson because they could score goals but the minute they cannot, they will lose games.