Not surprising. Barcelona absolutely won everything. Barcelona won in all lines. So a 3-goal victory was well deserved for Barcelona. Morlaness' red card also helped Barcelona win easily. But in the second half, Flick brought in Rashford and Olmo to increase the number of goals. But it seems that his strategy did not work. He even disliked the final result. They should have won by more goals.
I agree with this absolutely. Barcelona won and got all the three points but they really need to sit up and address the weaknesses despite it was the first game of the season. Sincerely speaking, Barcelona did not played intelligent game but instead making unnecessary mistakes and slow in decision making. The way Mallorca played despite on disadvantage with players down, they could have scored more than three goals if reversed was the case.