In my opinion, Schalke did play well to win that match but they also missed a lot of chances in that match and made some big and fatal mistakes. Really big mistakes were made by the defense and the goalkeeper gave the opponent a good chance of scoring. Also, Schalke missed some really easy chances to score. otherwise, the score would have been much different.
You are talking about the last game against St. Pauli? There were almost a sensation and St. Pauli would have won. Schalke came back with the penalty goal. If St. Pauli had won, the last matchday would have been even more exciting.
But St. Pauli played a great season. Unfortunately, the second half of the season was not good enough from them.