German media were impressed by Rangers after their stunning win at the Westfalenstadion, but ripped apart Borussia Dortmund.
The Bundesliga runners-up were favourites to win the Europa League going into Thursday's first leg, but were dismantled on their own patch.
Captain James Tavernier gave Rangers the lead from the spot, before Alfredo Morelos tapped home at the back post on a set piece.