I'm also having a problem with my air defenses. I'm on the Barents Escort mission in the NATO campaign, and none of my air defenses are engaging targets. I've given this mission several attempts, just to see if I can isolate my issue with it, and I've found that my defenses rarely, if ever, automatically engage incoming missiles.
I have to manually target incoming missiles with Evolved Sea Sparrows, and most of those passed their targets, turned around, and then attempted to catch up with the incoming missiles. I launched nine of the little buggers at a trio of incoming Klubs, and got two hits. The third missile zipped in and hit my Fridtjof Nansen. Phalanx didn't fire at all, and neither did the Mistral SAMs on my Skjolds when they were engaged. A single missile apiece killed each Skjold, as the Mistrals, when I can get them to launch, don't have nearly enough time to turn and engage incoming threats. I can launch at a Klub as soon as it enters engagement range, and my Mistral is still turning to intercept it when the damn thing takes out the Skjold. Combine this with the impotence of my Phalanx and Sea Sparrows, and the Russians don't even have to rely on high density raids.
SAMS and point defenses need to be a lot more effective. The Phalanx CIWS, in particular, needs to have rounds at its maximum effective range the instant a threat crosses it, as that's the way the system works in real life, and that's the only way it can give its ship a fighting chance. SAMs shouldn't get into a tail chase with incoming missiles when they were originally going nose to nose. I saw one of my Sea Sparrows almost touch fins with a Klub as it zipped past and then turned around to chase it. If the proximity detonator had gone off, that Klub would have been eliminated immediately. Instead, it took four more missiles to kill it, and another got through to heavily damage the Fridtjof Nansen.
I love the game, I just want my defenses to work for me, instead of for the enemy.