I would have to be of the opinion that
GW are capable of producing good rules, but they dont have the incentive to. As people above have said, back in the day,
40k was centered more on small, detailed, fluffy games, but as theyve grown as a business,
GW has become more business oriented.
Ive kind of got an interesting viewpoint on this, because I took a long break from the hobby around 2005, & just came back this year. Its very interesting (& somewhat saddening) to see that theyve seemingly completely changed the target audience of
40k.
This may be my inner cynic talking, but is it just me or is the whole 'apocalypse' business, & pre-boxed armies, & 'units' of 10 leman russes to a box aimed less at
GW's long time fanbase, & more to the young, fresh faced gamers who are more inclined to jump at the chance to field a poorly modeled, unpainted 7000 pt, uber-cheese army than more seasoned gamers?
& of course, with bigger boxes of minis come even more ludicrous prices. I thought it was expensive for a pot of chaos black back in the day, but I cringe at the thought of paying £2.20 for a pot these days.
I think its only
GW's size thats made this change, the more money they make, the more they need to make, & the more
40k becomes less a characterful, interesting game & more a vehicle for selling exorbitantly priced plastics to kiddies.
oh & while Im on this rant...

am I the only one who thinks that the quality of the models has taken a bit of a dive.
imo the new daemonette & bloodletter models are a step backwards & the thunderfire cannon looks like it was modeled on a cartoon doodle of an artillery piece, rather than something that could actually work.
dear me,
GW... how the mighty have fallen...