True, in adaptations studios in general are only taking the foundation of a show and making it their own, if the foundation is weak what can they really do with it? Also, while the industry is changing the norm is still studios that outsource a lot and use different staff for different shows (sans KyoAni) Just look at Madhouse as good as they are, they still have some pretty solid duds in their resume (ahem...Ninja Scroll the Series and Tenjo Tenge)
tldr; all studios vary in quality