Originally posted by Silent Master
Not to mention that even if Magneto is powerful enough to overcome the enchantment. Magneto has zero feats of moving heavy objects very fast or multi-tasking while moving heavy objects.So trying to control Mjolnir during a fight would be a very bad idea.
Ability to accelerate heavy objects = ability to accelerate much lighter objects much faster. This is due to fact that a net force causes acceleration. And also Fnet=ma