Thats a dumb question. For you see there are negative reasons to not play Ezreal as a tank. Think about it when you are playing a marksmen whats your most common problem?? Some BS assassin jumped on you and one shot you. But with tank Ezreal they will jump on you press one button and think you are dead. But that is when you flip the tables because just like the Spanish Inquisition no one expects tank Ezreal. Then in the moment of sheer terror before they die when they realize THEY were the squishy.

See to play tank Ezreal you must understand that you are a cute boy band member, and the enemy team is full of rabid fan girls who want nothing more then to touch you quite inappropriately. Since getting raped by random people surprisingly isn't your thing, you are going to kite randomly live when no one is expecting it and most importantly keep being a cute *** boy band member. With your good looks and tankiness nothing can stand in your way.

You see at the end of the game you judge your success like this. Where you able to fend of most of the rabid fangirls?
Yes- Good job you live to be a cute boy band star
No- Please Re-read this guide then go back to band camp and try again.