TLDR: As a mid laner, I found enemy WW to be f**king op.
I found his ult entirely frustrating as a mid main. Now I do not play him, so I do not know how much was the enchant and how much was the R, but I had to keep both rivers warded 100% of the time from 15 minutes onward to avoid dieing, and I couldn't go past the middle of the lane unless I knew WW was far from me. Why? His base move speed is too fast, he can get behind you if you push, even if you see him coming. Yes this is true of a lot of junglers, but it held you still, whereas other junglers could only slow you or hurt you in the little remaining space between you and the tower range. What I am saying is, the long suppress is powerful enough by itself as a gank tool, and i'm ok with it, but the damage took it over the top.
By itself, with the enemy laner completely ignoring me as WW ultd would take at least half my hp. This is with standard non-scaling defense runes. Add in a laner that is made to nuke people who stray too close (aka every mid laner in current meta) and you are guaranteed to die every time WW ganks. If WW's ult did 0 dmg, an aware mid laner could probably hit down at the very least 1/2 of most people's hp bar at this time. Don't you think this is hard enough with WW's ult doing the rest, not even needing his powerful Q finisher?
Im sorry I went on a little rant there... as a lone squishy laner, I saw the enemy WW far more often than anyone else. Many didn't understand just how easily they could kill me, but I did I silent curse every time I picked Syndra or Xerath or some other champ with no escape and inherent push, and then the enemy picks WW. I would have to play more carefully anyway due to how he works, but the dmg was a guaranteed kill.