1. Attack on titan: 6/10, the anime is great, good animation with epic battles, I didn't understand where the author wanted to go with the manga though.
2. FMAB: 9/10, I like the story and the characters
3. Naruto: 7/10, some great moments but the side characters are annoying af, even some of the main cast, the final war wasn't handled very well either
4. Hunter x Hunter: I only saw a few episodes, not enough to rate it nor get interested in, also feel like the author doesn't give a damn about his readers
5. One piece: 9/10, loveable characters, great build up of the story, good and original fights with different styles
6. Fairy Tale: 1/10, I read some of the first volumes, couldn't get to the end, too lame, not very interesting, I have no idea what the story was about, I basically forgot it already and that's for the best
7. Demon slayer: 8/10, I had no expectations and was surprised, simple plot but well written and executed, the characters and the fights are enjoyable ( I really liked rengoku).
8. Dragon ball: 7,5/10, it has inspired a lot of authors, simple story too but I like the fights and the will of the characters to get stronger despite the inconsistencies about power levels and the irrelevance of some characters at the end of the serie