Just had 4 flights on AM, all in Club Premier (J):

Mad-Mex 787
Mex-Lim 737
Eze-Mex 787
Mex-Mad 777

I was actually very impressed by the 787 product and service. The crew were friendly, in both Spanish and English, and the service was completed very quickly. I know some people are not fans of the starter and main coming together etc, but to be honest, it works well on these night flights as it maximises sleeping time. Dessert was lovely and served separately. Food was nothing to wrote home about but not bad either.

The 737 was also fine, comfortable recliner, and again,very good crew. The service was efficient and more even paced, despite the crew dealing with a medical issue.

The 777 on the other hand, extremely tired product, very noisy plane in comparison, and just smacked of "couldn't be bothered". Some of the crew were great, others looked like they'd rather be anywhere else. I would avoid 777 AM flights in future.