What Makes a Good Metroidvania?

I play a lot of Metroidvanias, but what separates the good ones from the bad ones?

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Attributions:

WoW Footage:
   • World of Warcraft UNDEAD STARTING ZON...  

Castlevania: Symphony of the Night footage:
   • PSX Longplay [369] Castlevania: Symph...  

Castlevania: Order of Ecclesia footage:
   • Nintendo DS Longplay [022] Castlevani...  

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