Hazard is world class. I don't know how you can possibly conclude anything else. He's been killing it in the Premier League for years now and his last three games for Belgium have been absolutely awe-inspiring. That's the level Messi or Neymar are playing at (but they do this far more consistently than Hazard).
That being said, he is pretty much all our team is built on. We have Carrasco on the left playing a very defensive role. If you ask me, he is bound to fail there at some point, simply because he is used to far more attacking roles. Same goes for KDB who is now playing a defensive mid position, in a two man central midfield! That almost has to go horribly wrong at some point. The reason we play this system is that it allows Martinez to field Hazard, Mertens, KDB, Lukaku and Carrasco all at the same time, but I'm not convinced we have to. Especially because we've got an abundance of world class central midfielders like Dembele or Tielemans sitting on the bench. And even if KDB, Mertens and Carrasco are on the pitch, I still see 100% of our attacks go through Hazard. I wish I was exaggerating, but I'm not.