is there really an huge difference

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ok we kno that the ps3 is one of the leading 3rd generation consoles but what is the difference between the ps3 and the ps2 the only ones that i can think of are: better gameplay better graphics blu-ray (although u need a hd tv to experience this feature) it looks quite cool comes with a 30 or 60 gigabyte hard drive can connect to psps with wifi plays ps1 ps2 and ps3 games well that all that i can think of similarities are: controllers look alike the first model looks a bit bulky (but i bet theyll soon be selling a slimline version) can play ps1 and ps2 games oh yes and the last similarity that i can think of is that its great! can any of you think any differences? because i can't