I am not an expert, however...
I find several places where you could improve...
First of all, you can design a default starting paragraph for your essay... Currently your starting paragraph has no link with the second one.... i would do the last sentence of the first paragraph something like this:
I find the authors argument not convincing due to the following reasons....
Then start the second paragraph with:
Firstly, ........
The other thing which cought my eye is that you like to repeat your stated arguments again and again....

especially in the second paragraph.... You should not do that, instead you could include somekind of the example which would clearly show the weakness of the argument.... You can repeat your ideas in the conclusion only.... (that is my view)
Some paragraphs seem to me not developed enough... Especially the one where you ask many questions, thus you should do some kind of the mini-conclusion on each of the paragraphs and not to end it with the question mark....
Thus for me, your mistakes are the following:
1) No standardised introduction to the essay is developed ....
2) No link between paragraphs
3) Repeating your arguments in the same paragraph
4) Some paragraphs are not necessary....
This is my subjective view...