I watched this game series a lot on Youtube

I don't doubt it, its clips were everywhere when the game initially came out.

the story is very good and dramatic

The very essence of this game is drama, without drama it would've been your average zombie hack-and-slash games.

the gameplay is also amazing.

Yep, even though it's a pretty old game it can compete with many modern games today. Its story alone is far superior to the ones today. Therefore, good graphics got nothing on a game that has an amazing story.

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