Well I'll say first of all that they're thinner than they were in 77 but I'd also say that the fighting styles do not align. If they have fencing sabers, they should be fighting like fencers, like in the original film. But they fight like in Empire, where the lightsabers were noticeably thicker.

Again, on paper the thin lightsabers are a good idea (and I thought so when I heard they would do it) but in practice when you actually see it in motion it does look rather silly. It's not a big issue but I wouldn't mind it being changed.