I'm on Moogle, and I'd say probably the majority (just about) of people I can't properly communicate with. I spend a lot of the time in the markets, and I see people asking for melding and such, but I only speak English so can't really help them out. I've had communication issues in a few dungeons too.
I have heard Moogle is the unofficial French server, are things much different on other EU servers? I might see about making a transfer. Thanks.