It must be like movies. Us amateurs watch a movie and we may find it memorable, because it speaks to us personally. But the film expert sees things we don't notice, or understands a depth which we're not aware of.
What makes a "great" game
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There are games that are famous and replayed over and over due to their importance. Fischer vs Spasky games for example.
There are also games deemed "great" just for their greatness.
So what is it that makes games stand out among the rest based on their own merit? Is it sharp tactical play? Brilliant sacrifices? Creative non-book play?
What makes a game "immortal"?