I often find with Cameron’s movies that I enjoy the Special Editions (I think he avoids the term “director’s cut”) a lot, but more as an expansion of the world that we have already seen in the regular editions.
They’re often less tight and focused than the regular additions, but after watching those and loving them and wanting to learn even more about the characters and story, I enjoy the expanded versions.
So in T2 for example, you get scenes that are not essential but which I like seeing – the Kyle Reese dream, the chip reset, the expanded scenes in Sarah’s hospital, the Max/Wolfie bit, more of the Dyson family, the T-1000 glitching.
And I like all that extra material. But at the same time it’s not necessarily the “best” version of the movie, and it does kill the momentum in places (there’s a stretch in the middle of the Special Edition where the T-1000 drops out of the movie for about 40 minutes).
I could say similar things about Aliens, The Abyss and Avatar. If I was sitting down to watch them now, I’d choose the longer versions, but I wouldn’t necessarily have enjoyed them as much if they had been my first exposure to these movies.
I would probably say the same for the likes of the LotR Extended Editions, or the longer cuts of Donner’s Superman films, or many others.
Some director’s cuts are shorter, though. I think that with Alien, Ridley Scott actually tightened it up a little. I don’t think I really noticed the difference, which probably means he did a good job.
One of the few films that I think is just a better movie in the revised version is Alien3, and even then it’s not quite a full Director’s Cut but a best-guess assembly of a movie that was messed with by the studio, so not quite the same thing.
Brazil is another similar situation – the Director’s Cut is an attempt to bring it back closer to the director’s original vision for the movie. Blade Runner and The Shining too.
Maybe the lesson here is that the best director’s cuts are the ones where it’s more about the director being able to undo interference in their movie by others, rather than second-guessing their own original cut and thinking they can improve on it (see also Star Wars, Donnie Darko, and countless others).