Absolutely not! The picture may actually be greater quality, because they've stretched it (professionally) all the way to the sides of the display, whereas they haven't with the NTSC. Therefore, the thin black borders will distort the picture at the very edges right and left. Also the audio isn't a problem... technically they don't "speed it up" anymore anyway, what they do is they "stretch it" in a way that keeps the pitch consistent (rather then speeding it up, which raises the pitch slightly). Also, you get thicker scan-lines on NTSC which may bother some people, and the NTSC pulldown - which is far worse the speeding the movie up 1 frame per second.

Personally, I don't think it would be worth importing PAL if you live in NTSC-land either.