I think his W needs to be changed somewhat. I played him for the first time tonight and cemented what I had already thought about his W... it's garbage.
I think it needs its range lowered, quicker to be activated and offer less. The activation part is what gets me, I not ONCE in a half hour ARAM game got anyone stuck in that thing and made any use of it. I either placed it to far to be of any use, or to close and by the time it activated everyone was either dead or out of the range, therefore no shield for me, no slow on the enemy and overall, just a waste of my global CD that I could have used on something else.
You have 3 seconds once it is placed to leave the radius, I have not once ever been caught in that thing and tonight, caught no one, you just simply walk out of it.