People talk about the GM "knowing the rules" and "being familiar with counters" and I'm sorry, but I'm going to call foul.
It's not just individual spells that are at issue, but their synergy (it's why it's called "scry and fry" afterall).
I am not convinced that the GMs on this thread have contemplated every synergy between the various spells in the Ultimate Magic, plus Core, plus whatever 3PP or campaign-specific stuff that's being used. That's too many spells, too many class abilities, etc to keep track of how they all might interact. And problem is, the 30 INT, five-thousand year-old Red Dragon the party is up against: he does know all those synergies and counters, at least in-game. Problem is, I'm his GM, I only have so much time to prep an encounter, not to mention his lair/backstory and other non-combat elements of the session. While at the same time, I have a handful of PCs pooling all their prep-time browsing through d20pfsrd looking for broken combos. I can't compete with that. And telling me that I should is just rediculous.
And then after they past him in one beautifically executed round, they ask "why didn't Mr Ancient Supergenious Dragon think of that, it could have been totally undone by X, Y and Z spells? They've been around since the founding of Thassalon." and then I throw the book at them, which was printed last month (considerably more recently than Thassalon's founding) and we're back to playing E6.