Yes, I concur, as does my friend who I have played the game with online for many years.
The problem is as you have described, additionally the at guns tend to spin in place, or settle pointing the opposite direction. Since they keep doing this, they often can't get back to position on time. Sometimes they can't get back to position at all. It happens in both 2-player and single player. This is tough on game-play since those AT guns are generally the key of any defense. And, yes, this has become prevalent since the mega update, on the stock maps in the core game. In fact, trying to eliminate any other possibilities, when I had to replace my hard drive, I re-installed Cross of Iron fresh, without any downloads or mods - only the mega patch - it all still happens (and same with my friend after fresh install).
As a long standing player of the game (since the original CC3) I can tell you that it basically, flat out ruins the game.
Please advise and thank you for your help.