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I didn't say he wasn't a world class player, no team can pay that amount of money for a player who isn't proven especially Real Madrid. He was a bad signing for Real Madrid doesn't mean he wasn't an excellent player. Some players don't perform well at other teams even though they were the best player in their formal team. Hazard was phenomenal in his formal team that's why he commanded such amount on transfer fee but was no were near even one of his best performances for Chelsea in his entire Real Madrid career. I can boldly suggest that Hazard was Real Madrid's worst signings in decades considering the amount of money the club spent in purchasing him.
As a bottom line you could argue that his performance wasn't the same as it used to be when he played for Chelsea, but in all honesty the fact that he missed almost 100 games in four years, club and national team combined, says a lot about his physical condition and it is quite normal for any player to not find back to old strength then. When you open up his list of injuries, it's ridiculous. He had literally everything and it was nonstop, hamstrings, broken ankle, like everything you could have on your legs.
If a top player is to suffer from a similar list of injuries, I would like to see how they would be doing regardless of the club they are playing for. One big mistake that Hazard did indeed make was to be overweight in like the first two months. But leaving that aside, he was extremely unlucky with his body. It is very rare that players suffer from that many injuries.