Overall, I was very impressed with the Rogue Trader system and its character creation. I'm fairly impressed with how the game organizes player origins and how it helps the group to create backstories for all of their characters.
You can see their paths below.
What was pretty cool was how organically that character's origins came up and then adjusted to accommodate each other. Patrick (blue) had the idea of being born on an agri-world and then coming up from nothing to become an Arch-Militant. Casey (purple) had the idea of becoming an Arch-Militant but starting as a noble. From there, the two players saw that their paths would be very similar, and then together created characters who came from two different walks of life but grew up together.
Matt (green), also wanted to be noble born, and linked his origin into both of theirs, so that now his Rogue Trader is the familial brother of Casey's Arch-Militant. Doug also linked his character onto their same home world, so now four of the player characters come from the same home world.
Because the two Arch-Militants faced a Calamity in their lives, the group came up with the idea of their home world being overrun by orks and then subsequently razed by space marines. This comprehensive creation of backgrounds, all interviewing was created by the group. It was awesome.
Jared (pink), linked his character into the family's saying that his character met the Arch-Militants when they were forming their own mercenary army. Along with that, Jared's character brings in Tony's (orange), because they were both enslaved upon the same ship together.
Now, there is plenty of background and flavor to go around, without the entire party having the same exact background as well. There's plenty of variation to go in there, like Doug's (yellow), whose character is literally missing years of his life while his ship, escaping the Calamity, got lost in the Warp.