Just reading everyone's discussion and comparisons to Grey Knights, hopes for Space Wolves unit types...i much prefer to think of the Chaos Codex as "doing what Chaos Space Marines are suppose to do".
Like i'd much prefer to see a Thousand Sons psychic Dread than a Night Lord one. It's what they do.
I'd much rather see Iron Warriors Havoc w/tank busters rule than a World Eaters unit of them.
Or Alpha Legion Cult Terminators Flank Marching, not Word Bearers Cult Terminators...