Played 'balanced' ARAM for the missions and some champions seem like overbuffed.

etc. (especially and ). I don't know how much they got buffed but they seem overpowered now. At least you could counter poke mages with MR + and make them useless at late game but there is nothing to do against those champions and they weren't that weak in old ARAM. They had lower win rate mainly because most people got them randomly and didn't know how to play them. Now a decent can almost 1v5 because she knows how to play her overbuffed champion.

Not all champions must have 50% win rate because hard to play champions didn't mean to played by beginners. I agree that some champions (especially junglers like ) needed buffs but some buffs seem too much.