no detail to play style, or reasoning for items/spells

you dont want to go 21/0/9 u NEED to go utility for him for cdr and being able to spam w/ the mana regen it gives you.

you get enough bonus from the scaling dmg on the q shot to make up for not having the 5% bonus in the offensive tree.

i find that maxing move speed is key on ez, because it lets you get in and out in a hurry therefore ghost/cleanse is much better..u really dont need ignite becasue u can ghost after someone and out range them w/ your q then use your e to get away safely and u have cleanse to help get away.

you get your tri force too late btw. having it as early as possible makes you amazing support in team fights for the bonus speed/slow/dmg and it gives you a bit of AP to make your other spells usefull.

id recommend sorting for higest build rating and using the extensive guide to AD ezreal that is here already. its prolly the best ez build ive ever seen. i have literally only lost 3 games as ezreal since using that build and won over 30