The Story of LeBlanc

So, yesterday, I played a game as LeBlanc. I first picked her, which is incredibly risky, but I felt like playing her again after so long. The enemy midlaner picks Jhin. I proceed to buy The Dark Seal and snowball out of control. I had over 1,000 AP at the end of the game, and could get a double kill on both of the AD carries at once by pressing W-W R-R. No one on the enemy team built MR. He complains about how broken the champion is. I die a bit inside. If you pick a immobile AD carry into a HYPER Bursty, super mobile assassin, and she gets fed, it is not LeBlanc's fault. An assassins job is to kill squishes. Jihn is a squishy with no escapes. Please, if the enemy laner gets fed, think about why, and don't rage about how your team is too heavy to carry.