Jinx has a massive AS steroid (or +10% damage and massive range, at her option).
Draven has his Q, which he damned well uses even late-game as well as an on-demand AS bonus.
Caitlynn has her innate and the best base range in the game.
Vayne has her %maxHP True Damage and her Q, which she also damned well uses late-game.
Kalista...is Kalista.
The point of my post was that Teemo's damage, even accounting for his E, rarely exceeds that expected of a ranged-AA-reliant dps machine (or, commonly 'ADC'), and usually falls short of common benchmarks for that role.
Teemo is outclassed as a damage dealer by ALL of those champions. Oh, and pretty much all of them also happen to benefit more from those 'ridiculous amounts of life steal' you think Teemo builds.