OTOH, my Australian mates (joining us in Mexico for an archaeological trip) said they had good flights and service - and even decent food! - on their MX flights LAX-MEX and MEX-LAX in J on AA award miles in November and December 2005. (Ths after flying QFs new J skybeds SYD-LAX.)
But MX is up for sale, so watch for possible big changes, IMO.