This was actually my second favorite Metal Gear game of all time. A shame most don't consider it canon. Other than having Mei Ling before Shadow Moses, it fits in perfectly with the rest of the series.
I never played ZOE. I just liked Gander because it just looked EVIL. Look closely, it's as if there are eyes staring into your soul. It just reinforced the notion that Metal Gears are mechanical manifestations of pure evil, and NO GOOD comes from them. Snake's daddy found that out the hard way when his got hijacked by TWILIGHT SPARKLE.