My thoughts is that TNG lasted too long, with them spending too much time on the holodecks anyway.Thinking a bit about TNG, and how the sense of wonder totally vanished from the show as it progressed, i keep wondering if focusing on some of the species like the Klingons, the Borg and the Cardassians and giving away so much information about them during TNG's later years and in DS9 was the wrong decission.
I can understand and like this fact for DS9 but for TNG, it may have been better if the producers hadn't done this so much.