Why do you like DH over the other 40k RPG systems?
For me, it is the grittiness, you CAN ascend to greater power and wealth, but most acolytes spend the majority of their career trying to survice. You are weak, you are in over your head but you MUST suceed. You need to be covert, stealthy, you are not astartes who charge in the front door, you can't do that, at least without tempting fate too much. You have to be smart, you have to play dirty, but you don't have to be. There are many options in how to play this game, but one thing is known. You are not a mighty army of the emperor's fist. You are not the mighty astartes. You are not scion to a ship, wealth and a warrant granting you status equal to an Inquisitor or a Lord-General. You are not a twisted heretic who desires the destruction of mankind.
You are Human, a single person or a small team, alone against the horrors of the galaxy, but together, you may, just may stop the slow death of humanity for just one day.
May your names be inscribed onto the gilded book on Terra.