Its quite funny the fact the game has such high rating on this website even though more than half of the pages here are criticizing the dev but are still gonna give 5 star . If these were given a year ago , it would have been the right thing to do but giving it even now
State of game and state of development are two different things. You can't give a bad review just because the development is bad, you give reviews about how the game itself is.
The rate of updates may be part of it because it does inform how often someone can expect updates and further improvements, but using a review to criticize the dev instead of the game is plainly wrong.
It is called "constructive criticism" for a reason, reviews shouldn't be abused for just bad-mouthing the dev. There is a difference between negative reviews and bad reviews. If the game is bad then it might not be helped that there will be negative reviews, but that does not mean that you should resort to creating bad reviews that don't focus on what is important.
Edit:
Then there is also the point that this is technically early access. People have to be aware of the disclaimer that it is not a finished product by any means, and that they pay for the current state of the game since it could be abandoned for whatever reason at any given point. You can include the fact that it is early access, but shouldn't make it the main point of a bad review. If someone would write something like "unfinished product, not worth it" then it would be a waste of a review, because early access is literally just that. Instead someone should write what the game currently offers and what impact it already has with that alone.