Ramsey has scored six goals for Arsenal already this season.
"Honestly, I didn't expect him to score so many goals," Wenger said.
"He's especially improved in his passing, his technical quality. He was always in good positions in the box, but scoring is a bit cyclic.
"You have periods when it goes in and others when it doesn't. For me the most important thing is the quality of his game."
But, given the severity of his injury, did Wenger ever fear Ramsey would fail to reach his potential?
"I decided to be patient with him because when you have been injured for such a long time it takes a while to get back to your best," he said.
"The only thing is, you never know if he will come completely back.
"But when you are injured before 20, you come back to your normal level and improve like you have not been injured."
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