Correct me if im wrong, but the Ak is more powerful it's 3-4 shots per kill.
And the FAMAS and the M4A1 both have better recoil kill in 4 hits (last time i checked, its been awhile since using these weaps)
All those weaps unlock earlier and IMO the FAMAS is better
The G36E has already been nerfed several times, there's lots of recoil in-scope, its still good, but by no means too powerful (IMO).