Can't speak to them specifically, but remember baggage handlers are often contract employees (especially in small destination airports), not airline employees, so the service can vary considerably by location, not just airline. Also remember that a horror story will get repeated over and over everywhere the teller has the platform, whereas good stories are rarely voiced. I really wouldn't give any of it much credence. Pack it well and hope for the best.

That said, crap can happen, but I'd never expect that any one airline is going out of their way to be any better or worse at handing customer baggage than the next. All of them are going to have crews that are fresh and careful, all will have those at the end of their shift and weary, and all will have those that simply don't give a crap. Which one you get on any given day is nothing but a roll of a dice.

EDIT: also make sure you know your airline policies for packaging, and importantly THE ACTUAL CARRIER of your first flight. If it is a codeshare, even if booked through Aeromexico, the codeshare's policies will generally apply at check-in.