WW is... well, he's no good, anymore. Used to be one of the easiest junglers in the game. Then they scaled the jungle up.
Q costs too much mana, and is his primary source of damage. It does scale of AP, but AP BUILDS ARE BAD, because it also scales off the target's HP, and you will only have enough AP to make that useful during early game, without nerfing all your other skills - no need for hybrid builds. Honestly, they just need to decrease the mana cost and remove the AP ratio, altogether - no need to change it to AD, because the base damage will get you through to the part where the HP% damage kicks in. The HP% is plenty of damage, and it makes him a decent tank killer. When jungling, Q is what does all the work, which means a successful invade can set you back almost 3 levels, because WW really can't take Lizard by himself anymore, and getting help after an invade can put your lanes in danger.
W is the only good thing on this guy. It counts for assists now, which is great, and it's a lot of attack speed. His base attack is pretty good too, so with the right masteries and glyphs, he can get by on this in the jungle, for a while.
E is useless. Completely useless. The range and speed are only significant at rank 3 or more, which you don't want early enough to make it any good. In addition, it only procs at 50% hp or less. The team fight is over by then. If an enemy is that low, they're going to die, or get out, and in most cases, they escape, because they have backup to help them, and you'd need practically an entire lane for E to be able to chase anyone down. E is completely useless for engaging anyone who is going to stay in a fight, and does not reveal stealth champs. This ability just needs to go. Either replace it with a group speed buff, like his W (call it "Leader of the Pack", or something), or come up with something else.
And now the R... oh god, the R. Suppress = good. It scales of AD, also good. Even though it is magic damage, it STILL BENEFITS FROM LIFESTEAL. This is important because it grants 30%, and you should probably already be building LS, anyway, so this ability at best will heal you to full. It also procs effects like Hydra's cleave, so you can damage multiple targets, if you build that. Now, the down-side. It leaves you completely vulnerable to everyone you aren't suppressing, and many times I've seen the animation continue when the target is no longer there (whether you've been stunned or not). I've also noticed a bug that needs immediate attention - Warwick will sometimes jump to the target and attack, but the target will not be suppressed at all. This leaves you swiping at the open air while the enemy team laughs and nukes you. So basically EVEN IF YOUR SUPPRESS FAILS, YOU MAY KEEP STANDING THERE LIKE AN IDIOT. This is very bad.
Basically, our dear puppy needs some love from Riot.