I always thought "Lower Decks" was one of the best TNG episodes. One of its highlights was the sparring session between Worf and Sito Jaxa, the Bajoran ensign. That was "mundane" yet highly intriguing.
To be frank: "Lower Deck" was a fantastic episode! I'm just not sure it would make as a good concept for an entire series.
The same way "Data's Day" was fantastic episode. Yet an entire series, in which every episode would be "Data's Day" sounds equally hard-to-impossible to get right.