The performance against QPR was otherwise rather underwhelming. As you say, a moment of genius, like the individual talent shown by Aguero to pick us apart when we pushed on. The stats today showed that we had more possession, had more corners and gave away less fouls. We pushed them today, they had to turn it on.
It wasn't perfect, and yes the lack of penetration from wide areas was a missed opportunity, yet that was far from our worst performance today, we played against a Man City team who gave us their best.
That there are such obvious areas for improvement from players who have already shown better says that we have another gear to go to. It's up to Koeman to make that happen.