Mark of Khorne is a direct "melee mark" even without uniques its a clear melee oriented mark. Traitor Assault can cap, where as Eldar and LSM melee specialists CANNOT cap. So this allows CSM to theoretically field melee over ranged for their capture setups. This is also part of what makes Orks melee specialists since Sluggas can cap aswell. Biggest melee weapon variety. Chain Swords and Axes. Power Swords, Axes, Maces, and Fists. Theoretically this would be a real advantage assuming Axes didn't blow dick, instead we basically ignore chain axes exist because chain swords are just all around stronger. There is also a decent host of unique melee weapons even though most of them suck since they arn't swords (besdies Necrotic Chain Sword which is actually amazing). While I wouldn't say "melee focused" is completely accurate its a general idea/concept to work with. I would say its more melee oriented than say LSM, which mostly use Shieldbros as a 1-2 of unit in organized squads compared to just lots of random people running around spamming Khorne emotes.