I always thought the pacing of the show was too erratic. Some things were allowed to plod along, wandering (aimlessly, sometimes) from this character to that....this set to that, without actually advancing the story. It was almost as though they didn't want to get to the next important revelation or suprise too soon.
On the other hand, they frequently skipped over things that would have made more sense and provided a more realistic narrative, if included.
One I've mentioned before is the utterly unrealistic treatment of the shooting and committment of Willie Loomis. All it would have taken was a bit of dialogue to cover the legal and law enforcement requirements of committing someone to a mental institutution.....but they never bothered. Nor did they bother when it was time to get him back again for the Adam storyline. Just a reference to a review of his records by some entity would have made his rapid return to the community a bit less implausable. But they didn't bother.
On the other hand, could they possibly have played that stupid loop of Dr. Lang's tape recording any more often?
Too much time spent on some things......not nearly enough time spent on others. My vote for the most frustrating thing about DS.
