By the time you get Zeal, you'll deal out so much damage with Wuju Style + Highlander you'll kill anyone in about 4-5 seconds. Use Exhaust and Speed Up/Flash if you really want someone to die. Remember that killing a Champion with the Highlander buff still active will refresh all cooldowns, including Highlander.
The key is to remember that Yi isn't a tank. He'll die fast if he gets focused on, so you'll want to remain in the forest farming and only come out to gank someone then retreat to the forest.
After you get Phantom Dancer and 1-2 parts of the next piece of +ATK gear, you can frequently wipe out entire teams before they can even blink simply by ninjaing from the forest while they're distracted by something else.
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