I'm just going to list my personal items that I find appealing about the PS3:
1) The online games selection. Almost all of it, but particularly Flow, Everyday Shooter, Super Stardust, and the upcoming Flower and Echochrome. Really awesome stuff. REALLY. I can't emphasize enough how much I approve of this selection.
2) The UI is very aesthetically pleasing.
3) It never breaks down.
5) Little Big Planet.
6) Afrika.
7) Blu Ray.
Those are the first things that pop in to my head -- I really just decided to do this because I had a sudden, overwhelming urge to state how impressed I am with the PS3's online offerings, and decided to make a thread in which to contain that idea. Now, someone else make this thread into a more coherent PS3-love fest, please.
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