Let's set a palatable objective

We just ask for re-assessment: en:Wikipedia:WikiProject Anime and manga/Assessment :p

While not a big deal in appearance but B rating is one step before GA or FL so people asking for B rating explicitly ask so and B rating was meant to be only given after project re-assessment. B class is the project sole standardized "stamp" of quality so it's not given lightly.

Assessment is handled by experienced project members and B class is really set higher because of the absence of A class rating.

Projects not using A class tends to use "Stronger" B class aiming for what a "proper" article should be in term of content, verifiability and manual of style compliance. It still need polishing and fine tuning through peer review for GA or FL but the essential is there.

For further reading: Crazy A class talk and look for G.A.S in detail explanation why animanga sticks with "Strong" B.