User blog comment:Tankteam/ADC Tierlist/@comment-5077844-20150116165030/@comment-24420226-20150116222913

Ez is the ADC who literally has everything an ADC ever wants - Auto attack steriod (passive), strong AD ratios for poke/burst(Q, Ult), kiting/mobility (E, CD reset from Q) ; he just doesnt have these things in such great magnitudes as other ADCs might.

In the current meta, Corki and Graves fulfill each of thes role  within a team that  Ezreal often does, but to greater effectiveness: Corki has better poking/kiting with his missiles, Q, and Valkyrie; while Graves brings a stronger presence in teamfights, with his Q and Ult for burst, and W for peel/control. That said, while Ez may not be top tier right now he still is the "jack of all trades" ADC that is always a strong pick through reliability, flexibiilty, and play-making.

Also, Kog and Twitch are dropping a few tiers because the current meta strongly favours bruiser-based dive-comps (with Irelia, Vi, and Katarina rising in popularity), and these guys are extremely vulnerable to those kinds of tactics. Tristana doesn't have this problem (having both a lengthy jump and big multi-person knockback). Janna is already a popular support, but you might also see Alistar come back either in top or bot lane to counter these dive comps