It has a dated look about it now. But it has its charm. Futuristic? Yes, I still buy it as being in space.
I tried to like Enterprise but one of my beefs was it had too much of a TNG era feel to it. I wanted more TOS era buttons and toggles.
And every time I come to the conclusion TOS is so outdated it's cartoony, episodes like Trials and Tribbleations and In a Mirror, Darkly proves just what a classic it was and still is.