The thing is, TOS IMHO still holds up as a great show. TNG seems like anpther show from the 80's. The first three season of TNG are my favorite.
By the sixth season when all they did was stay on board the ship and have all the peril come to them, (Since the actors were now being paid to much and they could not afford loaction shots) I lost my drive for it.
When it went off the air, I didn't really care. But I still love the first three seasons! Love the props, including the dustbuster phaser and that big clunky tricorder. I remember the sense of awe when Riker first tapped his communicator and how cool it was! They brought back the sense of awe and wonder that was Trek, but around the fourth season it began to wane for me.