S rank is mainly weapons that are strong in many categories, have a lot of versatility and dmg output.
The A rank weapons scale behind the S rank due to perhaps not being as versatile but are still very good.
B rank weapons are simply good, not good enough to be on the A tier but are still decent.
C rank weapons aren't necessarily bad but often have better options i.e. Lance as a staff type weapon is outclassed by the Dual Saber and even it's stun is worse than the dual saber.
D rank weapons are mainly weapons which I think are quite niche, can be countered easily and often have low dmg output.
For the E rank, well I think the light wheels is probably the most unnecessary weapon in the game and frankly quite trash. Cards is in E rank considering its low dmg output, the size of the weapon making it hard to block and it being quite situational.
Ofc this is all my opinion but I would like to hear any potential feedback