Quote Originally Posted by Vicious View Post
Enspell II are designed to be used in situations where you are meleeing and casting in roughly equal amounts. The damage increases with each swing to encourage you to keep swinging; the maximum damage is set higher to compensate for lost damage while casting; it only applies to the first swing to prevent them from being used purely for the damage; the magic evasion reduction is there to increase the accuracy of your spells since you're not using a staff; the damage is calculated each swing instead of at cast because... nope, I got nothing.

In other words, the reason you don't like Enspell II is because it does not fit your playstyle, not because they are terrible; they could use some work though, I'll be the first to admit.
A much simpler explanation is that the second tier of en-spells were designed by a deranged maniac and thus just do a bunch of arbitrary and weird stuff. To support my "a crazy man designed Tier II en-spells to appease his giant insect gods of nonsense" theory, they don't even reduce Magic Evasion to their own element.