Sailor Mercury, although she may not be the most powerful, is a needed addition to the Sailor Team, especially in the manga. Why do I say particularly the manga? Because oof her one REALLY cool attack. Yup, you guessed it-Shine Snow Illusion.
Ami is a really in-depth character. You can't just love her all the time or hate her all the time. She's so developed, she seems real, like a person. And as you know, every person has "good" and "bad" days. I have to admit, dubbies usually hate Sailormercury/Ami. Even I did when all I had seen was the dub. Now I have a shrine to her! You really have to see the original to see her "other side."*
Having said all that, there's only one more thing. Mercury is like...Dark Chocolate, where Sailormoon the series is chocolate. She's a personal preferance. Thank you for listning. *for more information on her other side, see the page on my main, titled accordingly.