There is nothing to doubt about Liverpool and Bayer Leverkusen because after all, the opposing teams such as Atalanta and West Ham although not a weak team at all. But still, at this moment that Liverpool and Bayer Leverkusen are the best teams, so of course Liverpool and Bayer Leverkusen have a great chance to be able to advance further to the final match of the Europa League this season. No matter about the reasons or good scenarios for Atalanta and West Ham because of course, Liverpool and Bayer Leverkusen will be able to maximize the good moments in this season to get the trophy. Afterall, Atalanta and West Ham are also teams that are not completely stable and therefore, it is difficult for Atalanta and West Ham to beat Liverpool and Bayer Leverkusen in this knockout phase.
I don't think anyone would have thought Liverpool and Leverkusen would lose that match. They are both on a different level compared to West Ham and Atalanta. Liverpool and Leverkusen are the best teams in the European league this season. So I think everyone will predict they will be able to beat their respective opponents.
An exciting match is AC Milan vs AS Roma. Both teams come from Serie A. AC Milan is the favorite because they have a higher position than AS Roma. But imho they are both on the same level. Milan was slightly superior but the outcome of the match was still unpredictable. No team is too strong compared to other teams. I think AC Milan vs AS Roma will be the most interesting match in my opinion in the quarterfinals.