I have Deathwatch and Rites of Battle. I'm aware that there's an adventure in the back of the rulebook, but I want to know what adventure or campaign is probably the best for players who are only vaguely aware of the lore of 40K and Space Marines and who haven't played any 40K RPG before. I've played a little bit of Dark Heresy and didn't care for the low power levels, so I was hoping I could cut my teeth on Deathwatch with an adventure that can illustrate to all of us, referee and players alike, how Deathwatch is "supposed to go".
This could be an entire 3-book campaign or just the adventure in the back of the book, and I understand that I probably won't get a unanimous answer since, y'all know, subjective opinion and all.
Still, a simple "I like X, wherein Y happens, because Z" is a perfectly fine answer, and I appreciate any help that comes my way.