WW needs a rework
The issue with a champ like ww is that you can't have a champion who is both very easy to play and lacks counterplay, is focused around 1v1s, and chases well. I think that xin has a similar problem, and jax to an extent, as well as others. They end up just being stat-checks to see who will win the duel, whereas champions who can chase but aren't quite as good duelists (yasuo), or are still easy and good duelists but are kitable (darius/garen), at least have that type of counterplay.
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Warwick has the feeling of being entirely useless pre 6 as someone who learned jungle with warwick I still feel useless pre 6 because my best ability also has a very piss poor range before I get my ult. as for xin well he is better than warwick because he has a solid engage at 3rd level, and now jax.... this guy has a decent engage an evade with added stun and the ability to nuke you after he gets his ult. out of the three jax is both the hardest and the easiest to play because he has a lot of differing options that warwick and xin don't have
and some what 
face this situation.