We had an Award Ticket (issued with miles/points), so we didn't really pay full price for our ticket, that was a plus.
Aeromexico is an average airline compared with other airlines around the world, nothing they do, neither on the ground or on their planes is special in any way, just plain average.
The only thing worth mentioning: t it was a DIRECT flight from Mexico City to London on a new 787.
If you are only staying in London for a few days, the fact that Aeromexico has a direct flight saves you hours if money, on connecting flights, layovers in other cities, countries, hours in immigration if you stop in the US and so on, so that was a good thing, other than that, it was just average.
You do get complimentary wine and beer on their flights, which is something you do not get in any US airline, and seem to have a little more leg room that most US airlines as well, so that is another advantage.