Click on the record of any current top heavyweight and find someone matched tougher than Joshua this early in their career. Barring Pulev they're all "terrible" (I would say the norm for a talented prospect)

First 7 fights

Stiverne - his opponents had just 32 bouts between them with only 13 wins.
Wilder - 46 bouts 17 wins.
Wlad - 176 bouts 64 wins.
Joshua - 142 bouts 91 wins.

Two of Joshua's opponents have been in the ring with "world" champions (three if you count Prizefighter). With his profile he should be matched a little tougher than the norm but it's not his fault he's bowling over guys that have taken world champion/challengers deep. It would be even more shit if Joshua wasn't wiping the floor with these guys. We'd be looking at a powderpuff boring heavyweight.