A simple analogy would be this:
If the 360 lets you get from point A to point B in a straight line, while the PS3 takes strange turns and paths to get from point A to point B, then it simply takes considerably longer to walk from point A to point B on the PS3 than it does on the 360. They can both get there, however.
You can blame the developers for not walking the whole distance, but you can also blame the people who designed the path in such a silly way; that would be Sony.
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