People like this are why Steam has all this "early access" crap going on where the reviews of a product someone paid money for "don't count" because the game "isn't done yet." If you're taking my money, you're asking for my opinion. End of discussion.
Start of discussion, off on a tangent about Early access as you raised it.
Early access is not a finished game. If you are buying it as a finished game, news flash, it's not the game's fault it's yours.
When you buy any game, you buy it on the content that is there or you take a risk. Don't take the risk, unless you trust the developers to the point of having a good purchase history, or just like helping find and fix bugs, or contributing ideas.
Buy games on their content, look at a few reviews on youtube etc. Reviewing an early access alpha or event a beta game the same as a full game is nuts. If someone labels their product incorrectly, then of course they deserve flak, otherwise no. Doing this i've never been disappointed in an Early access product, as I always knew what i was getting at the time. A year later I might go back to them and see what was added, if nothing was, then I still got what I thought I would for my money.
-edit
Some further helpful info. Thankfully my collection of early access titles is doing quite well in maturing and stuff I bought for very little money, because I look for a couple of factors. How often are updated released and how well do the devs communicate with the community.
If these two seem favorable, that's even more reason for me to take an interest.