Wall of Pain Revert

Wall of Pain is a really weak skill right now because of all the nerfs it has received over time. They were necessary before, but today we have much stronger competition and I think some reverts would be deserved.

Some nerfs to wall of pain I'd like to see reverted:

Wall of Pain Wall of Pain Wall duration reduced to 5 seconds from 7. Slow application changed to once from per-crossing.

 Wall of Pain Wall of Pain
    New Effect: Wall slow is reduced to 20 / 25 / 30 / 35 / 40% after 1 second.

While Karthus isn't super weak right now, I see changes for rengar and yi (other completely fine champions) and I think Wall of Pain is a bit like Yi's W in that it's an incredibly weak ability.