Loads, higher resolution in pc monitors VS TV sets, different chipsets - the PC version of a game has to support any number of graphics cards, whereas PS/XBox are always the same, memory varies from PC to PC as well.
I prefer my PS2 for gaming, simply because my PC gaming experience (by and large) goes:
Delete stuff off hard drive to make space for game
Install game
Download and install patch
Update Windows with latest DirectX version/Patch
Swear a lot
Play game
and 2-4 years later buy a whole new setup because your PC isn't up to scratch to play the latest games
PS2 gaming experience:
Insert disc
Power on
Play game
and the same PS2 will play PS2 games in 4 years
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