AP ezreal is too strong, meanwhile AD ezreal is a bit weak.
Ezreals AP scalings are higher than Annie's and he has four means of damage, instead of the three that Annie has. So if Annie's broken, then AP ezreal is shattered! Ingame, the ult does about 80% of people's health (squishiest like adc and mages, not tanks) which is way more than other ults and has GLOBAL RANGE. Meanwhile, his QWE combo is enough to kill someone if he lands them all on the same person. I feel like his AP ratios should be tuned down a bit and his E shouldn't scale off AP, thus balancing him.
However, AD ezreal actually lacks damage right now due to his W being useless in this build (besides the small buff) and his E has a bad scaling. Increase the AD scaling for his E, allow ezreal to gain the buff as well (not just his allies) and he should be fine.