I don't really mind this since I enjoy playing a conjuror based class. However, I wanted to be a destruction based class. As is, I can completely stop using Destruction and it would barely effect me. Beyond getting impact, I see no reason to have anymore points in this skill.
I have invested in the Fire line as well as Master magicka reduction and if it remains this way, I'll not be selecting anything in fire past impact again. It falls under the same reason I have Alteration. I leveled Alteration simply to get the +30% magic dmg reduction. Purely for the buff. Had I been able to foresee what lay ahead of me with destruction, I would have only gotten impact as I said above purely for Crowd Control ability. That said, Impact is a great perk being that it allows me to stun 3 enemies at once if I time myself well. Then again, I suppose I could just use Illusion to confuse them instead...
/edit Sorry, I'm a bit drunk and had many finger mistakes. The mage skills themselves are not broken. It's only Destruction that lacks. I'd like to quote something, though not verbatim, that I read on these forums. When a skill is called Destruction, you expect said skill to destroy. Currently, Destruction destroys nothing. It would be better named if it were called something like Fireworks etc...