Yes, I think there are no surprises there, maybe only for Eintracht Frankfurt because the team he knocked out was the favorite team was Barcelona. But for the rest of the team I think it's natural for them to reach this stage, and about Rangers they also have a fairly even opponent. Yes, Rangers' opponents in the quarter-finals will be Braga even though, Braga in the local league is not a regular title-winning team, so it's not a surprise at all maybe except for only Eintracht Frankfurt.
It is shocked to see Barcelona failed. More shocked to see they were beaten by three goals. And more surprised to knkw they could not score at least one goal. Because before that terrible loss, Barcelona have many good matches amd scored a lot of goals. Combined them all, the win of Frankfurt is a big surprise.
Looking at four clubs in semi final, I consider West Ham and Leipzig as better clubs and I bet them will play against each other in the final of Europa League. Frankfurt will be beaten by West Ham in my opinion.