I feel compelled to state in FFG's defence that they were also not responsible for the aborted hack-job of a system used for the 40k RPGs.
Dark Heresy was first published and printed by Black Library, as were the first few supplements. The system is a port of the (in my opinion fairly abysmal) WHFRP II system by Green Ronin, which was in turn fairly close to the original WHFRP released by Games Workshop in the 1980's.
FFG has done what they can but the base system just isn't very good. I got the feeling, especially when playtesting Deathwatch, that they would like nothing better than to throw the system out and start again but licensing agreements mean this isn't practical. I would love to see them re-do the system in the same vein as WHFRP III or EotE but sadly I can't see this happening for a while.