reviews
If you are going to call these, Essays, then all the reviews need to be moved to "essay" space. right now, reviews are held in mainspace.
I put only those reviews which are written as one author's personal experience/thoughts on a text into essayspace, because in that style they are incompatible with mainspace. The others, which are written from the general point of view of our mainspace, are fine as they are.
Well, all the ones by Fed something or other, are his personal views about the books or films and his own counters. I think either "reviews" are essay, or they aren't. and maybe that's something worth deciding or not. But taking some out of essay space and not others isn't consistent.
The difference is easy to see. The ones that use the first person belong in essayspace. The ones which use the third person can be mainspace articles.
The alternative would be to edit all reviews and remove the first person so as to put them all in mainspace, which I don't want to do, especially seeing as Thanatos purposefully put his reviews in essayspace.
That's rather arbitrary and should have nothing to do with how essays are defined. Half of the essays in essay space are 3rd person. Reviews are comments about a film or book by One person. That's what all the reviews in the section "review" are.
Feredir has written most of the reviews in the review cat, and they are all just his opinion. I think "review" should be something distinct from article or essay. but we need to treat all of them the same, and not just say "oh, it's first person".
I am only applying this criterion to reviews, because that is what you asked about. I am not trying to define the entirety of essayspace. There is an arbitrary distinction between reviews, mainspace articles and essays which we need to sort out, and there isn't a magic way to avoid this problem.
The easiest solution would be this: Keep the "reviews" category intact, and let pages' authors be the judge of whether or not their work goes into mainspace (where it can be edited mercilessly) or essayspace (where it can't). If the author of a review voluntarily places it into mainspace, in mainspace it should remain. Anything we find disagreeable can be edited according to the principles of a wiki. But if, as Thanatos did, the author purposefully places their review in essayspace, it should stay there (within reason).
There is no good reason why the reviews category can't span both mainspace and essayspace pages. In the absence of a review namespace it's the best we can do.