I've played a **ton** of Warwick top recently (I really love it), but I've found that his ultimate doesn't suppress properly.
There have been many times when a Yasuo has been able to throw his knock-up Q after being ult'd, Thresh being able to use his Q/E while he's ult'd, etc. I've even had one instance of someone **grabbing a Thresh lantern** as I hit them with the ultimate.
It's incredibly unreliable to use, and it's such an important part of his kit. =/
Not only that, but after using Q and holding it down, his auto attack animation stops for a brief moment before it begins again; he just kind of stands still and does nothing.