Before going to the table, I'd like to explain my criteria when I rate any series or movie. Basically, I tend to give as much importance to the scriptwriting and the story than to all the other technical aspects (acting, scene composition, lighting, types of shots, color, etc.). Why do I do it that way? Because to me, the way a story is told and paced, as well as the way dialogs are written, is like the work of an architect, while all of the technical aspects that bring the former to life are like the work of a constructor. And if you want to build a house, you can't choose one or the other - you need both.
So that's why both are equally important to me: a story with artificial lines of dialogs, which feels too forced in order to reach certain objectives and where the plot is stagnant and the characters are plain, too superficial or poorly developed is something I could hardly consider a good movie, no matter how good the materials are. And inversely, a very good work of storytelling and scriptwriting means nothing and completely falls down if it's built with a weak structure and deficient materials - when the technical part fails to achieve minimum levels of quality.
Another thing that I should point out is that I adjust my judgement to what I'm watching: for a comedy, I mainly expect that it makes me laugh or at least smile; for an action movie, I expect... well, action. And so on. If a movie offers what one should logically expect from it, and does it right, I'll try to rate it accordingly.
Also, in relation to that, I want to say that I like to go as blind as possible into movies, so the only information that I generally have about a film before I watch it is the score in FilmAffinity* (I don't like to go that blind =P), sometimes the genre(s), if I want to watch something specific, and less often the release year, in case I'm in the mood for something newer/older. The reasons why I do this are 1) because that way I can adjust my expectations to what I'm actually watching, instead of having some preconceived ideas about the movie, and 2) because that way there's a lot more room for excitement and surprise. Still, it's not always possible to go blind into a movie (particularly in the case of big blockbusters or franchises), but I do it more often than not.
Lastly, when I rate a movie, I try to always be fair, and also use all the technical knowledge that I have to make my score as well-grounded as possible. However, I'm just an imperfect human amongst billions, so my own personal criteria, and my personal interpretation of that criteria is just one of many and doesn't have to match anyone else's. Also, I don't consider myself an expert, but rather a very curious, art-prone mind in a process of constant learning, so my technical knowledge is continually improving over time and the judgments I'll make, let's say, in five or ten years are probably better than the ones I'm doing now. In any case, it doesn't matter much, because in the end these scores and the comments that I may make are just my opinions, which I'll defend and back as best as I can, but knowing that they're only that: mere opinions in a ocean full of them.
*Speaking of FilmAffinity, I use that website because I find that the scores there are the most trustful on the web (at least for me, and that I know of) and not too inflated by default, like in other sites (IMDb, for example). Also, another reason why I use it (which doesn't seem to be available in the English version, unfortunately) are the reviews that other people write about the movie. Not always I read them, I must say, but sometimes I like to do it and, while not all all of them are interesting or useful, sometimes you can find good reviews that are much worth reading. Also, having different perspectives is always nice.