When someone hates a new or old installment of a series. Even if the newer/older version is superior in every way, one who has Flamstalgia will find something to complain about, and say how it doesn't compare to the version they played and loved originally.
Veteran Player: I am tired of this Modern Warfare 3 nonsense, COD 4 was the shit man.
New Player: No man Modern Warfare 3 is the king of COD, it doesn't suck. I tried COD 4, it is terrible.
Non Player: They are both very similar and you guys just have Flamstalgia.