Not just Klingon culture though, in particular Worf as a character became worse the longer he existed. At the start of TNG, Worf claims that Klingon culture is completely alien to him, having been raised by humans. I’m not sure how early it started, but at some point the writers decided to make it Worf’s one goal in life to be the most Klingon a Klingon could be. This caused more and more episodes to be fully dedicated to developing Worf’s Klingon ancestry.
I recall Worf being in “I am Klingon, hear me roar!” mode right from the get-go. This was greatly disappointing to me, 'cause there was plenty of opportunity to explore the “nature vs. nurture” debate with the character, and it all went to waste.
The episode I was referring to is “Hide and Q” which is episode 9 of season 1. Worf is granted a Klingon bride by the power of Q, and Worf objects, stating that he has nothing in common with the woman I believe.