His conversion is fine. In raw % it's better than Aguero, Kane, Sturridge and Vardy over the last two seasons.
https://twitter.com/DanKennett/status/737654143142252548 Same is true of "big chances" as well so it's not just because he doesn't shoot from range or whatever.
I think there's two ways you can look at it. He's basically been on the end of most of the good chances France have created so far, which either means he's integral to the side and with a different type of striker half those chances wouldn't happen. Or, his limitations have such a big effect on the team that they can basically only create through crosses etc, in which case getting a striker like Griezmann instead could make a massive difference to how well they play. I've kind of concluded the latter at Arsenal, but I haven't seen any of France with Griezmann or Martial as a 9 before, so I'm just completely in the dark as to whether it would be better or not. Given how many chances he got tonight and how good his goal record is for France I'd probably just stick with him unless he has a completely dry game against Switzerland.