I can't really say that I attended the Novus Ordo because I was out of the church from 1968 till like 1995, and then I went into the Latin Mass. Nevertheless, the few times that I went to the Novus Ordo at weddings and funerals, I noticed that the mass was in the vernacular, but the priest were from Latin American or from India and it was difficult to near impossible to understand their English. I saw this so often that I came to think it was a punishment of God upon those that wanted the mass in vernacular and all the other shenanigans of the New Mass. 

Fast forward 20+ years and now I'm seeing SSPX priests being sent here from France and it is difficult to near impossible to understand their English. Moreover, they are bringing with them their local customs and changing just about everything they can. I'm thinking that my parish did something wrong, for this is certainly a punishment. It does not affect me because I am well read and I know the faith, however, anyone new to the faith is not learning anything. I do not see any growth in any of those less knowledgeable in the faith. It seems like the all spiritual growth now depends on the individual and if he wants to learn on his own. 

What kinds of things do these French priests do?

If you mean what kinds of USA customs do they change:
 
- they do the dialogue mass
- they change the low mass postures to the dialogue mass postures
- they stand for the high mass at the Sanctus, the Agnus Dei
- they change the statues and paintings and such
-they move everything in the chapel that is on the right ( stations, statues, paintings) to the left , everything on the right to the left, everything in the front to the back…….
 
France went big time into “updating”  the Latin Mass long before Vatican II, the USA never did. The French priest are bringing in the French customs that led to Vatican II.
 
The customs of each country should be respected just as much as any doctrinal tradition. By changing everything to the priests whims, all tradition can be changed without anyone knowing if it is a tradition in another  country or just a personal innovation of the priest. The priest have no right to change the customs of the country that is hosting them. 

I wouldn't call those 'french customs' but 'french liturgical LIBERALISM'!

That's how the French have been doing it for nearly a century.

The French Church has had their problems for a long time.  The Gallican sect was basically trying to form their own Rite in the 1600's, which was supported by King Louis XIV as a means of control over people and trying to control the Church.  You also had the Jansenism Heresy.  I remember reading that after the French Clergy sent a petition to the pope to reconsider his condemnation of the varying degrees Jansenism, the Pope replied with excommunications of the 1 Cardinal, 100+ Bishops, and 3000+ Priest that signed the petition.  That's a sizable number no matter how you slice it.  So this news that the French have done these things for a long time is not really a surprise.

I don't think foreign accented priests are a general punishment!  Isn't that a lot to lay on a priest who is simply being obedient in going where he has been told?  Given ample time, most priests' English does improve.  Like everyone else, some are better with languages than others; speaking and understanding.  Perhaps it IS a punishment for certain individuals. "If the shoe fits, wear it." 
 Having to focus on an accented voice can also be a means to more graces if one would ordinarily not give the sermon his full attention.  Personally, I find I'm more attentive to the sermon if it is in one of my secondary languages, not American English.

There are speech tutors who specialize in lessening atrocious accents. Businessmen and actors are some of their prominent clients. It amazes me that someone would bother to learn a second language, but not care if he could be understood by native speakers after going to the effort.  I think it might be because people are too polite to mention the subject. "Excuse me Fr., but you command of the language is so poor that I couldn't understand your advice in the confessional or your homily", makes me wince at the idea. Maybe an anonymous note on the back of a speech therapist's business card in the collection plate?  

You should be thankful that you have a Priest.  

Mass is said in latin so that a priest's accent is not a big deal.  I'm sure it's annoying that you can't understand the sermon or his advice, but you do have mass, which is FAR more important than anything else.