They are working on BF4, supposed to have a patch next week. As you say though, growing pains. I did however give KillZone another shot and I have to say it is quite awesome. Game is beautiful, I am just having to get used to the mechanics as I have never played a KillZone before.
Have done quite a bit of racing on the NFS, and even enjoying Extinction mode on COD Ghosts.
As for blue light of death and other issues, it is indeed a very small percentage, around 6%. Now we will remember that is much less than the about 80% of Xbox 360s that had problems in the beginning.
I am sure Microsoft is smirking at the PS4 launch, but their day is coming up and it will be interesting to see how it plays out for them on their launch.