Graphics: Gamecube vs. Xbox vs. PS2 vs. Dreamcast

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DirtyP2002 said:

IF the Gamecube was the most powerful system, which is nonsense, why were the following games not released on it or the PS2:

• Doom 3
• Half-Life 2
• Riddick
• FarCry Instincts
• Enclave

And please tell me why SC CT looked so bad on GCN compared to Xbox

One could equally ask why Rogue Squadron 2 & 3 weren't on Xbox.