I realise I have not posted very much recently, been busy with Christmas and other things. I also have not finished, or really even started the Chaos Codex review. The reason for this is that I was reviewing it before I really had played that many games, and my opinions on certain units are continually changing.
It seemed to me that everyone and his dog was using Khorne marked Lords with the Axe of Blinding fury to start with. As time has progressed, Daemon Princes with the Black Mace have become more popular, and I have even started to see them on normal lords. The reason for this I believe is that unlocking Berserkers into troops really isn't that useful for an army that has a lot of close combat capable troops.
Other cult troops offer a different take on the sit back and shoot method, and most of them are better than the options that are available elsewhere in the book. This isn't the case with Berserkers, who are very poor if they don't charge, and in subsequent rounds of combat.
Thousand Sons are good anti MEQ, Plague marines do a decent job of objective holding on cheap and Noise marines have exceptional anti horde weapons and one of the best heavy weapons in the game. Not quite the best, that position belongs to the Eldar Dark reaper tempest launcher IMO. But it is certainly not far off the best.
All Berserkers do, is throw a bunch of attacks down. You can do this more effectively with terminators, spawn and even possessed.