I'd rather people discussed the movies in question, and why they are good or aren't.

Well, bringing up the parts of a film you liked is discussing why you think it's good, right?

It simply says 'I liked it'.

Right, but then people post in those thread and talk about things they enjoyed. It's not like everyone is just say, "Yeah, I liked it, too".

Any legitimate negative criticism is down voted, any legitimate positive criticism is virtually non-existent.

I do agree that that's a problem, but on the flip side, there are many directors who've developed a hatebase, which isn't really right. I want to hear criticisms from someone unbiased and neutral, not someone who belongs to the "I Hate Fedora Director #72 and All His Fans on /r/movies" Society. To give you an example, I remember a few years ago that a composer accused Tarantino of just arbitrarily putting songs he likes at random scenes, sullying the art of film scoring. All the people who have a bias against Tarantino come out of the woodwork and agree with this wholeheartedly. But that's an absurd assertion that no rational person could support. The music in his films is meticulously placed, even if it is campy at times.

No, that's kind of lame.

Why? If you just got out of a movie and are excited about it, of course you'd want to repeat the best parts. It's fun.

What do you think /r/moviescirclejerk do all day every day?

Circlejerk and shitpost, whilst accusing others of circlejerking and shitposting.