Why Do I Still Suck At Writing Anime Reviews?

I recently had someone ask me what they could do to improve their reviews (or something similar) and it occurred to me at the time that what they were writing was perfectly readable. Which then of course made me wonder what actually made for a good review and made me think about my own writing which after three and a half-years of blogging (and nearly 4000 posts) is still a work in progress.