Is armor useless?

I mean seriously, why play anything other then AD? Leathality is the most obnoxious mechanic in the game presently because Riot are too stupid to make it (Melee Only) like {{item:3074}}. Why are ADC's allowed to abuse this mechanic as well that makes it so that any armor building on anything that isn't a super tank like {{champion:57}} is utterly useless. But MR is still useful and can effectively protect squishies from taking too much damage from magic based abilities. GOOD JOB RIOT! Could this game be anymore biased towards AD based champions?
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