I just caught this on TV over the Xmas period and I enjoyed it. Perfect Boxing Day viewing. I admit I ignored it on its initial release 16 years ago as it was most uncool to like Rom-coms at Filmschool ;-) my only gripe is there is always such a strong whiff of Woody Allen that breezes through these types of films...but, maybe that's not such a bad thing in itself.
This could have been so good but the script is appalling - saved from one star because of the concept & because I like John Hanna. Also Gwyneth Paltrow is very unconvincing. She was only good in the Royal Tenenbaums.
Average uninteresting romcom/melo... BUT with a basic idea extremely powerful and philosophical, not enough seen in cinema: Life (biologically and sociologically) is chaotic, meaning extremely sensitive to initial conditions/settings.