I only have a 360 connected to an HDTV over component cables (rather than HDMI, which is supposed to be better) but games do look lovely in HD, so if you have an HDTV I don't imagine you'll have any complaints over the PS3's graphics. As others have said you would need to hand over a lot of cash for a PC that could give comparable graphics and you'd still miss out on a lot of the console-specific genres that PCs don't really support, and would have to go through the fuss of driver updates, DRM-shackles and the like.
Hell, if I had the cash to lay down on a high-spec PC (the kind that could run Crysis in its full, non-Vista glory) I'd probably plump for a PS3 and 360 instead.
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