Its great for brawling, you get the most fun out of Gripen by using terrain to get in close and then firing around 10-14km, and taking dogfights.
Who knows if Marlin details are ever released it might get Marlin later on to replace the R-Darter.
The issue i have with them is their low acceleration causes them to get chaffed, only time i get kills with them is if the target doesnt chaff.
As of now, I only have problems with the Derby is locking things with TWS, because sometimes it just goes for some random stuff in the air, and i checked, there weren’t any missiles nor chaff. Incase you are wondering, I am using the F-16D Barak.