Why are save games so big on the PS3?

[HappySqurriel]

Kamahl said: Well, it's up to the developer... MotorStorm for example uses less than 1MB but when you download the update it goes to 22 MB. To be honest, i don't mind using 22 MB on a better game. And if you need more space, you can just upgrade the HDD.

Just as a question, didn't a lot of PS2 fans put down Microsoft's entry into the console market claiming that Microsoft would lead to people needing to upgrade their systems and download patches for games?