What is a good ADC in league of legends

ADC (now officially known as Marksmen) could refer to champions who have been tagged as Attack Damage Carries, such as:

• Ashe
• Caitlyn
• Corki
• Draven
• Ezreal
• Graves
• Jinx
• Kog'Maw
• Lucian
• Miss Fortune
• Quinn
• Sivir
• Tristana
• Twitch
• Varus
• Vayne
• You go bot when you're adc btw