You're pretty good
The catchphrase of Revolver Ocelot from the Metal Gear Solid series. A sign of high respect and admiration. Given to him by Big Boss in MGS3, then given from Ocelot to Solid Snake many years later.
Big Boss: That was some fancy shooting. You're pretty good.
Ocelot: Pretty.....good.
Ocelot: Pretty.....good.
you're pretty good for a beginner
the nicer way of telling somebody they suck at something that they have just started to do. translates into "you suck, but since you're a beginner it's okay."
Kelly: wow you're pretty good for a beginner!
*wow she sucks, i hope she gets better*
*wow she sucks, i hope she gets better*