In coach...Y is Y, so I don't know what criteria could be used to describe it as horrible. The food will be mediocre, but it's always been...bring some snacks and some personal entertainment. AA flies the 763 and the old config 777-200 to Paris, so seat width is fine on both planes. I'd rank the 777-200 ahead of the 763 in Y.

If you're on the 777-200 or the non-reconfigured 763 in J overnight, the seats are angled so you may slip down a bit while you sleep.