Final Level: The Summit of Sacrifice
Why It Sucked: Dude, you can't just kill Athena. We know you're mad, Kratos, but she's been helping you the whole time! You couldn't have killed some other, lesser gods, like Dionysus or Hermes (no, that happened in GoW 3)? Chuck this one in the "we could have wrapped this up, but no one buys shit unless it's a trilogy so we might as well add a pointless plot twist to pad out the next game" pile.
How We Would End It: We would have ended this series on the second one, with Kratos actually killing Zeus instead of accidentally murdering Athena and then leaving on a cliffhanger (albeit, a pretty good one). Actually, scratch that—we would have ended it at the first game, which had a resolution that actually made sense.