Udyr benefits from Malady quite well. Not only does he desperately need the attack speed, but the lifesteal is very helpful and his tiger stance triples the damage malady gives. +90 damage is very, very awesome.

Malady is ****. Even the grossly underrated wits end is better. Buy a last whisper, or a wits, and then get a vamp scepter if you want lifesteal. Turn the vamp scepter in to a starks if the game goes for a long duration, now thats helping your team, not this malady ****. Everytime I get killed and malady is part of the equation it's like "Autoattack 900, random nukes/spells 600, malady 30-80". You really think malady helped much there? Wits does 42 on the first hit and you can potentially drain someones mana , and I'll tell you right now that a ton of heroes become insanely screwed with no mana. I honestly don't think I've ever had a death recap where malady did more than 100 damage to me whereas I've seen tons where I've taken 800+ from autoattacks and only 60 or so from malady. It's just not really even part of the equation as to why you killed someone and you're better off getting any other aspd item.

I like LW better on Udyr. He's an good tower killer and LW is great for tower killing.

Malady is good for champs that consecutively attack a target quickly and use a proc-based damage strategy (instead of a DPS * crit * armor pen strat).

Malady + Wit's on Phoenix/Udyr is some raw pwnface for example (large fraction of damage does not scale with crit, and some doesn't scale with ArPen).

Most champs aren't in the business of consecutive proc-based attacks. Many ASPD champs are more aligned to crit/arpen (YI) for maximum damage multipliers.

Those who are can use Malady effectively.

Malady: early-mid game, single target, 2v2:

At this point of the game, a fight can last long enough to make malady count. If malady is your 1st item, you're increasing your DPS by 50% (minus other speed boosts per build & character). In the 2v2, you're not only increasing YOUR DPS, but your allies as well. On this note, I'm pretty sure you get all the credit for malady damage caused by anyone, as I've gotten killing blows on enemies I certainly did not last hit (but had malady debuffs on them).

Mid-Late Team fight:
Far less useful. Unless you're twitch and hitting the whole team at the same time with your basic attack, the damage proc is trivial. Even as Twitch, it's not a great late game item... there's just too many better attack speed items.

As Mundo, I'd rather just save up for a Stark's. He hits slowly and hard enough that the extra damage is going to be worthless, and the aura will help his team more.

During early and mid game, you gank people or harass / finish them with burst damage.

You only spam autoattacks in early game if you're talking a low skill level, no offense, or someone makes a ******ed error.