I took about 3 flights roundtrip from GVA to Mex and they were all bad. First of all
They mad me pay 150 euros because I was not 15 years old and this was just to put me in their staff lounge.
Once they cancelled my flight to Paris and their only option was until two days after when they have 2 daily flights to Mexico.
Also the check in in Mexico is terrible, when in AF in Y it takes me more than 1 hour in LH (same airport) it only takes me 20 min. And the same in C, AF: 30 min, LH: 5 minutes.

I also think their flying blue progam is B.S., so I might not love LH but is much better.