What Graves Has:
84% damage if standing at his maximum range to attack a target, and his auto attacks can be body-blocked if you're anywhere but point blank.
No innate healing. Olaf, Aatrox, and Warwick are NOT defensive-stat champions. They're self-healing champions.
Olaf and Aatrox have health costs. Warwick has only 3 abilities, since one doesn't help in lane. Quite a few champions have better laning phases.
Graves may have great jungle clear, but his ganks are as bad as they come. All he brings to the fight is damage.
Melee-ranged effectiveness on auto attacks. That's why he's at a loss against those ADC's with very high range.
Warwick and Olaf are in dire need of reworks.
Aatrox got hit with the nerf bat early in his release and hasn't seen enough play to get any compensation, because he's no good with the typical Guinsoo+Sated + whatever you want jungler build.
If we're going to be comparing champions, we need to use relevant ones. Fair game for Tanky Melee champions that have had recent work and don't rely on lifesteal would include the so-called juggernauts.