Annie isn't 'OP', shes just extremely un-fun to lane against.
All the talk about Lee-Sin being so un fun to play against, but honestly hes funner to go against than an Annie IMO. She gets pretty much free last hitting in the laning phase, and she has possibly one of the best ultimates in the game: No cast time, can stun if her passive is up (which you just need to spam E to do) and does very high AOE damage, easily capable of deleting one or more champs. Shes not exactly easy to kill, almost every Annie builds Rod of Ages/Rylais/Zhonia's, and her E combined with those are easily enough to make her durable and hard to kill. At least I have a chance to live through a lee sin combo, the only real way to live through an Annie combo is to not go near her if her stun is up, but flash takes care of that for her. Thoughts?
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