Oh. Oh, honey...
Your writing is horrible. I mean really. Not just the spelling.
1. How everything flows is an issue. Your fanfic is...clunky, for lack of a better term. It doesn't read smoothly. You need more description beyond the basics. Like "The rain fell down my face," can be expanded into so many different sentences without going into purple prose.
2. Spelling is still an issue, I think. It takes a beta reader and a spell checker to improve into a still pretty mediocre attempt at grammar and spelling. You need to do stuff like that by yourself with little to no help. I couldn't help but laugh when you called the spell checker "Stupid a**," or something like that. I thrive on spell check. I'm a terrible speller a lot of the times. I don't spell like you but I still have some issues with it. It's to help you, take advantage of it!
3. The characters. Everyone is a cardboard cut out. Draco hates Muggles. This has been established a blue million times in the books. The original characters are Mary Sues beyond all Mary Sue-dom. They remind me of the characters in the My Immortal fic. There is a reason your fic has been compared to My Immortal time after time.
4. The plot is really flimsy. Draco just suddenly gets to be a professor because not only did a lot of Hogwarts teachers die during the war of Hogwarts but because he's one of the best wizards of our era? Uh, no. Say your school experiences some tragedy, like some sort of shoot out or war. You don't get to be a teacher because a lot of teachers died and you made As and Bs most of your classes with the occasional C. And it's not ever been stated that Draco is one of the best wizards of the Golden Trio's era. If anything, Harry is. In a letter to Hermione, Viktor Krum was gushing to her over Harry because of how advanced in school he was. Viktor was graduated and he didn't know half of what Harry did.
5. READ THE BOOKS. Goodness! This annoys me. A lot of plot holes you have in this is rooted in you not reading the books. You get a better feel for the story and the characters. You understand everyone and everything a lot better than you do with faulty book-to-movie transitions, like the Goblet of Fire movie and Michael Gambon's portrayal of Dumbledore. Butterfly in the skyyyyy, I can go twice as hiiiiiggghhh. Take a look, it's in a book, a reading RAINBOOWWWWWW!