I think you bring down your own case...not forgetting Sebastian Ruster, Jonathan Tehoue.
All could have the odd good game, or in the case of Comminges, a steady enough season, but when judged didn't do much, before disappearing with Gallic shrug of the shoulders.
To me, Bangoura, Balmy and Traore look terrible....Robert offers a bit more, but has a lot to do to prove he's a decent Div 3 player.
We just happen to have had French players...the odd Belgian Dane, Finn, Czech, Portugeezer, Spaniard, Italian, Estonian have all been shit too.
OK there's something to be said for the comical badness, of our 3 musketeers, with Robert as d'Artagnan.....certainly stand alongside, Adrian Bakali, Kim Heiselberg, Marko Tuomela, Lukas Magera, Tijane Reis, Landor Gabilondo, Alberto Comazzi, Henrik Ojamaa....in the rib tickling stakes.
OK I may be a bit harsh on Gabilondo.
Dutch....fare a bit better, but they play darts and cricket so to be expected.
Well there's a lot I agree with there. To your list you could have added - sticking to permanent signings only - Togo (Dossevi), Namibia (Risser), Australia (Brownlie/Robertson), Nigeria (Yinka Casal/Onion Bhaji), Argentina (Cobian), Egypt (El Gabas), Trinidad & Tobago (Shakes). Oh and while you're sucking off the Dutch: Antoine van der Linden.
All of which only seems to indicate that little clubs like us without a serious international scouting network tend to take generally unsuccessful punts on foreign "talent". So you can safely extend your little Englander instincts beyond Frog-bashing to a more general xenophobia. HTH.