Because it was only 2/3 of a game!
I beat it on Romptacular Easy Mode on the flight from Houston to Phoenix, and it's pretty and entertaining and pretty entertaining. But what was up with that, uh, ending?
spoiler (click to show/hide)
It really, really felt like there was an entire area missing after the Persephone fight--the Elysian Fields felt like a turning point for Kratos, not the conclusion. And then the non-animated ending is like, "and Kratos went back to Earth and totally kicked Morpheus' ass. Off-camera. THE END."
A decent game, really, and good boss battles (if in GoW1 numbers, lol). But I would have liked to have seen some more creative setpieces and fucking around with the mythology. Wait and buy it for $20 on PS2.