(Disclaimer: this is drawn from experience from earlier versions of the game, which I assume still holds)
For those skeptical I just want to emphasize that the great delight in playing this game is that you win by much less by model stats over maneuvering correctly. It´s a game of clever use of the board and understanding of flow of battle rather than picking the deadliest unit pre battle.
E.g. If you send your mighty Chaos Warriors straight at the pesky Empire Pistoliers, they´ll most likely just gallop away with jeers ringing in your ears and the next thing that happens is a thick block of Halberdiers crashing into your flank. In all other GW games this will make little to no performance change by the Warriors, but not here. See, this game might look like any other battle game, yet it is really about Morale and positioning. What happened now in the view of the Chaos fighters was that an unknown foe attacked from a blind angle. Does this mean the whole army is surrounded? Fleeing? Is the General Dead or maybe Fled? They don´t know.
Enter the Morale rules. You fight, but the games is less deadly than other GW games, so the bonus due to the smart maneuvering kicks in and most likely will force a Break test upon the CW. If they hold their nerve they can turn and face the threat, but the take home message here is that their martial superiority was out the window at that moment and things could go either way despite the difference in troop quality.
This aspect is what I and many with me loved about the game. It´s a game of correct positioning over pre-game picking deadly troops and combos.