Well I can say the l96a1 was NOT nerfed, I got an unbe with it while I was rushing in snow valley just quick switch instead of the bolt action. The g36e Was also not nerfed in my mind it still has the magical ability to shoot through walls and lotto headshots all day log. Its just how you use the gun I guess but l9 vs aw the aw would win, unless a few guys I know have the l9.
In general they have been adapted for more advanced snipers and for more spray. But I hate the g36e, the C is so much dam better than it.
The M4s90 has one bad thing and that is the overkill spread when standing.