Warwick's new ultimate animation isn't scary enough
The leap itself is pretty sweet, but once he's doing the slashy bit he looks less scary and intimidating than when he's just sitting there autoattacking you. In terms of clarity, it's easy to tell you're being ulted, but the animation looks pitiful and doesn't convey the idea that you're getting ripped to shreds well enough. It looks way too much like the normal auto attack animation, and SLOWER to boot; compare this to the old warwick ult animation, which sort of looked like his autoattack animation sped up several times and on steroids.
This also applies to the sound, the pitch could do with being a little higher. Again, sounds like he's just autoattacking. Sounds less intimidating than a single Rengar Q soundbit.