My raid group has had quite a few bad experiences with french players in sephiroth. The biggest problem is their inability to communicate.

My biggest problem with the french people are their insistence on qeueing "wrong". I only have english language selected and yet earlier today i god paired up with 3 frenchies. And god they where bad, stuf was dieing slowly and when one of them DC's it took almost 10 minutes for him to come back. Tried to vote kick the offline player because i didnt think he was coming back and only after it failed did i notice they must have been a premade 3 man french team. Didnt want to leave because I had a raid scheduled soon and didnt want the lockout. After he finally came back i got a vote dismis myself.
The whole time not a word was said by them. Thats the french in general for you.

Lucky not all of them are like that, there is a french player in my fc and he is actually quite good/friendly.