"pretty good level" is a correct phrase and can be used in written English.
It means a high or satisfactory degree of quality or achievement. Example: "After months of practice, she finally reached a pretty good level of fluency in Spanish."
"He's still performing at a pretty good level.
"His conditioning is back to a pretty good level now," Low said.
"But I do feel that I was able to play at a pretty good level, pretty high level today.
"We think it's actually a recognition of the new reality and the new environment, and it's a pretty good level," he said of the new target, which he called "reliable, reasonable," and one "that we can exceed over time".
...If you think about what football players have to do, or basketball players, with quickness and agility and speed...if you're up and down the court for 40 minutes a game in college or 48 minutes in the NBA, you've got a pretty good level of fitness as well.
It's necessary if you want to get beyond offering a pretty good level of customer service, some of the time, to offering a reliably high level of customer service almost all the time.
By day two or three, you should have a pretty good comfort level of what they want from you and what you can expect from the internship.
"But it did provide us with a pretty good confidence level that we were getting data that was representative of the state". While some water districts ignored the state's request for data, San Diego went out of its way to challenge the survey.
The Tar Heels are taking on a pretty good lower-level team in James Madison, and hold a 13-0 lead in the first quarter.
It's a pretty good entry-level DSLR that's easy to use.
While $749 is hardly "cheap" by the standards of mid-range handsets in 2018, it's a pretty good entry-level price for an Apple handset.
