I know that the last time GW published legitimately good rules was in 2009 (War of the Ring), which is now only available in a bastardized version and seems to have been a fluke in the first place.
I know that GW charges Premium Product Prices for most of their rules, and that the quality of those rules has, with few exceptions, ranged from "somewhat acceptable" to "abysmal" when compared with other (cheaper) wargames, for over 20 years.
I know that a cycle of partially broken rules, and the updates/fixes for them, is a core part of the GW business model.
They make mostly excellent models, which they over-charge for (especially where I am). In the 80's, 90's and early 2000's, they were making some truly enthralling lore - and lots of it. They have rarely, ever, made a non-broken game system.