Speaking as someone who reviews TV and movies for kicks and giggles, I can honestly say that my own ratings are meant to be fun. Also, I make no bones about my bias in favor of shows that mean something -- either in terms of character or theme -- beyond the confines of the story (in other words, does the film have meaning beyond what its characters want). I also assume that readers take my reviews for what they are: just a single point of view and opinion. Nothing more, nothing less.
Actually, while you describe this as your personal bias, it is a perspective that I feel is missing more in general criticism and would assert it's a reason why criticism in general is losing its relevancy.
A problem I feel with many critics' methodology is that while they do compare a work against other works and history, they seem to go in expecting a work - be it a movie, tv show, computer game, album, or book - to impress a significant meaning on them entirely by itself. I don't think this is realistic. "Meaning" is arbitrary, and a human construct. Nothing means anything by itself. Things
mean something to people.
So, critics these days often seem to take a work, and find it lacking because it doesn't somehow do something for them, inject a sense of meaning in them, for them. It seems akin to cynics (in the modern sense) lamenting that culture has become meaningless, when it is in fact the cynic who has retreated from deciding on what has meaning. Is it related that so many today who take it on themselves to be critics, are highly cynical? Seems likely.
With genre work, using sci-fi films as an example, I believe mainstream critics fail to see all sides of the works because they have no inherent interest in the themes that the genre work incorporate. They don't care about space exploration and technology, transhumanism and hypothetical frameworks of fictional worlds. The most the average mainstream critic will go is finding Star Wars a rousing good time, because it's really a human adventure with sci-fi trappings that don't go too deep and are mainly colorful and funny.
But for the critic who doesn't really care (or ever even think) about such things, the average genre piece is an oddity where people walk around in tin suits going "beep beep". When such a work gets a good mainstream review, it seems it is usually because it incorporates and emphasizes a traditional story of human drama that really doesn't require the genre setting to play to another audience. And that's the framework that the mainstream observer couches their critique in, because it is the one part they have some connection with.
There's nothing wrong with that, and such works allow a wider audience to find something to identify in them. But it does leave the average genre work just a bunch of nonsense to an uninterested observer.
In my rambling way, I suppose I'm pondering is that many contemporary critics seem blind to this or never to have considered it; worse, in some cases they may consciously operate from the perspective that their world - whatever it is they consider the mainstream - is both dominate and the only perspective of any real value, and in those cases, it does reflect in their opinions which are frequently asinine and condescending.
It's funny; some of this came up a few weeks ago when I was discussing the original Tron with a couple folks. I observed that a good deal of what makes Tron a classic film isn't anything contained just within its surface story, which is a simple hero's journey told simply. Aside from its groundbreaking VFX work. Rather, it was how by both accident and design Tron's framework slotted in with eerie timing and prophesy to the coming age of information wars, corporatism, art vs business, and the garage creations of the first generation of technohackers and computer pioneers' own creations getting away from them. To a person reviewing Tron even today based upon the most generic mainstream criteria, it is a boring movie with creative but strange costumes and sets, and The Love Story is poorly done (because there is, after all, always A Love Story). It's a strange curio piece that doesn't mean anything.
To another set of people however, Tron's virtually a holy artifact out of time, with that quasi-religious aura reserved for events that seem to transcend the order of things to human senses. And the MCP as the literal malignant spirit of a corporation gone wrong is one of the most vivid metaphors in history.
When looking at the reviews for this Tron sequel, my own thought isn't "how good is the acting", but "will it have another subversively delivered theme that only becomes apparent as time passes, or will it be "merely" a good sequel to Tron?"
That's the sort of thing that requires a different order of consideration from how films are typically reviewed to fit the 500 word quota, and keep up appearances to one's peers.