AAA is not a well-defined term.

It's generally used to mean the games from studios with the largest staffs and budgets, and they are, therefore, expected to be a GOTY title every time.

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To be fair, that analogy in your other post is off.

Should be closer to:
You're a huge fan of accordion music and you see a massive crowd of people leaving a show with dissatisfied grumbles, and you learn that there's a new polka act inside. You learn that there's still plenty of people inside who didn't leave the show.

What do you do?