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It's not that they are OP, and its not that only a few champions can actually deal with them. Its the fact that there are games where at least 8 people have flash and ghost at the same time... do any other spells exist? Ignite maybe.
The point of summoners spells is to add to the players gaming style...instead everyone from tanks to casters is using the same few spells. I've seen Kassadin have flash and ghost...clearly that's overkill considering his ulti...but what else can he use when flash is one of the only spells that can make a huge difference. Why not flash spam ?