Back when Firestorm first rolled out there were a bunch of changes that broke stuff in normal multiplayer, some of which may not have been entirely intentional, but isn't about time it got fixed?
First off, the netcode. The netcode worked perfectly fine in the patch before you rolled out Firestorm, then afterwards all the problems we thought had been fixed were back in full force. I actually find this a bit odd though, playing Firestorm the netcode seemed fine but it was a mess when I went back to normal multiplayer.
Secondly, the weapon swap system from Firestorm gets carried over to the other modes. This causes two problems, it broke reload canceling and opens the possibility for players to exploit a bug an carry around 2 primaries in other modes. Originally the player could cut a reload short by double tapping the key to swap weapons, causing them to just pull the gun out again instead of finishing the reload, but that now does nothing as it now swaps weapons to the new sidearm slot in Firestorm. This is troublesome for scouts as they can no longer cut a reload short when they see a glint off in the distance, but even more so for those using the M30 Drilling as it automatically reloads after the shot and doesn't let one swap firemodes without canceling or waiting several seconds for it to finish.