Discouraged by Chat GPT's ratings

FYI, I am used to writing academic articles in English for uni, therefore I do believe I quite got a hold on it by now. Yet Chat gpt's ratings are really bringing me down lol. The funniest part is that even after redacting them and applying the suggested corrections, chat gpt corrects its own suggestions lmao. From your experience, is the rating accurate? Not to suck my own d*ck but I do believe I deserve a higher rating, considering I have a pretty solid vocabulary and my essays are well-structured...