master yi vs warwick

Alright, I'll be more specific. Warwick sucks as a ganker until level 6, and only then if he's got his ult. His damage output is lackluster and his sustain is his only remarkable feature. His Blood Scent is a useful ability if the champions are below the threshold, but even then it only reveals them; it's still up to you to get to them, and they know you're coming.

Yi is one of the fastest snowballers in the game. He can be beat down the entire game, but come back from it and get kills in the end. If he's played well, no ADC will survive him. Most people play him like he's a Fighter, but he's not. His damage output is insanely high with even a few core items, and he doesn't fall off at any point in the game if he's played correctly.

I emphasize the "played correctly" part because way too many Yi players think they should initiate fights and get smashed in seconds. But a good Yi player is truly terrifying, whereas Warwick just sort of putts along and never really does anything amazing. Even when he ults someone, if he doesn't have help he can't finish them, even an ADC.