The game that started it all, the original God of War is considered one of the best action games of all time, and a lot of it still holds up. The dark story of Kratos seeking revenge against Ares is just as strong as it was back in the day, the combat is still bloodily satisfying, and the bosses remain amazing.
So, why is it in the lower half of this list if it's a classic? Well, there are some things about the original that haven't aged well.The second act can feel somewhat padded out, the combat isn't quite as robust and responsive as it was in later games, and a few puzzles can get annoyingly difficult.
However, those are manageable when compared to the awful platforming, climbing, and balancing sections of the game. Sure, God of War's platforming isn't what people remember, but you know what will stick in people's minds? Sections where you can't judge your jump and you die over and over again.
Oh, and that section where you climb out of hell before you can take on the last boss can go right up Hades' ass: It's broken beyond belief.