I'll always have fondest regards for the original enterprise, as she was a real trailblazer and others are just imitations. When they were doing TOS, a lot of thought went into the enterprise design, and they really worked at making it plausible, from warp drive to the deflector to the idea of seperatable sections, the ship was really a huge leap in SF engineering, and not just "something that looked cool",
Everything else stood on her shoulders.
I never liked the D, the saucer was too big and not circular, the engines too small and the whole thing looked too aerodynamic and abstract. That said I did not like the way dick vermin destroyed her, as a symbolic bulldozing of Roddenberry's vision after he died so he could replace it with his own.
Trek really went to hell after GR died, with "The jeri ryan show" officially turning it from anything resembling SF and intelligent programming to "baywatch in space".
The new movie went way too far to piss on classic trek continuity, and as an almost symbolic bit the dye job on the green orion girl in it looked far less believable than the very first green orion girl we saw in "the cage" over 40 years ago...
That said the new enterprise was OK.