my two cents on improveing at 40k

[Nick]

Psycological impact was a point i was going to bring up later. Knowing how an enemy is going to react to certain units you bring helps you dictate the flow of the game. The threat of elite infantry, tanks or monstrous creatures can really draw firepower away from your other units, or force the enemy to try and avoid them at all costs, either one is good for you if you exploit it