Well I just came back from a fun filled weekend at Gen Con. In addition to playing board games, costume contests, and hobby seminars I was able to pick up a copy of Deathwatch and the GM Essentials both of which are written by Fantasy Flight Games.
It is important to know that I am not a big role player and I only play the occasional game. But this book makes me want to become a full time role-player. The book is fantastic. They have a great mechanic for combat and I especially like the way they deal with space marine’s ability to fight off hordes of enemy troopers. The fluff is well written and they do an especially good job giving us the fluff we need to know about the Deathwatch and still leaving some mystery. They write about the chapter, specialties , organs, armor, alliances, battle tactics, etc. The classes, also known as specialties in this game, are pretty standard; if you have played a RPG you will recognize these classes right off the bat. One of the areas that could be fleshed out are the available space marine chapters. Fantasy Flight in their wisdom has already addressed this: the designer of the game mentioned that an expansion is in the works with extra chapters as well as full rules to design your own chapter.