I am not a big supporter of a tightly meshed rating system and I have never said that I want a system with greater set of intervals. I find tightly meshed systems unnecessary, abstract, unreliable and imprecise. The biggest problem with tightly meshed rating systems, if they are going to be comparative (which they have to be if they are going to have any value at all), is that their complexity and work intensity have an exponential relationship with numbers of movies added to the system.
This argument could be used to forever advocate a greater and greater range. Why stop at 9 or 10? How about 1-100? I give
The Dark Knight a 92.5:
It's not the 0.0-5.0 system that is especially "abstract, unreliable and imprecise."
All such encapsulations are. The solution, then, is not to rely on ratings to encompass your feelings about a film, and to write descriptive reviews, instead. A rating will never be able to approach that level of precision, no matter the scale.
Personally I am very fond of the 5- and 9-scale systems, because they are the easiest to give fixed sets of criteria to. E.g. for the 5-scale: very bad, bad, neutral, good, very good
This is completely arbitrary. There's nothing about the number 5 that makes it easier to assign fixed criteria to than, say, the number 6; particularly when half-point intervals are allowed. On our scale, 2.5 is the center, rather than 3.
And it should go without saying that, if you rate a film a 3, you cannot reliably expect it to mean the same thing to them as it does to you ("neutral"). The odds of a given person assigning the same terminology to your ratings as you do are quite slim.
It is not absurd to let people give a movie 0 or 0.5, but I find a rating system which starts on zero to be counter intuitive. Zero is an abstract in which the human mind isn’t very comfortable with. Most people can easily define the numbers 1, 2, 3, etc. for you, but try making them define zero and you have a different tune. By comparison this is one of the reasons the “Runner-up”-system is rarely used when ranking contestants in a competition.
I'm not sure how your reference to a "runner-up" system has any relevance here, but regardless of that, I don't find the concept of zero to be terribly troubling in general, and certainly not when it comes to rating movies. It can be done relatively: if 1 is very bad, then 0 is even worse.
Or, if you insist on framing everything in broad, conceptual terms, then how about this: 0 is the absence of a number, and therefore a rating of 0 is the absence of any redeeming factor in a given film. Ta-da.
And where did I say that one rating system is superior to another?
It is implied when you criticize the existing rating system, obviously. Criticism of any kind suggests that there is a superior way of doing things, or else it has no meaning.