Why is Ezrael so bad as ADC
His laning is mediocre, needs mana items for midgame like Sheen and Muramana (or he goes oom and dies), has crappy lategame dmg unless he builds like regular ADC, but there is no reason to pick him instead of Lucian, if you aren't going for Triforce or Blue build. AP Ezrael is way better as burst caster, but his Q is not magic dmg and can't deal with armor. Corki looks like better poke ADC with midgame powerspike with almost equal safety - you can't even waveclear with Ezrael reliably, if you are sieged - you can ult 1 time and the next minion wave is lost tower. I think that he needs some changes - almost every new champion has a dash and you can't kite them at all - they step aside or dash away and you have 0 DPS after that because you have no AS and crit items.
was a better burst mage then an ADC?