TLDR: Slayer has no ranged, and should be the best melee as a result. He should get Dual 1 Hammers and an invincibility buff to leap so that he is the best at what he does, while still retaining the weaknesses of having no ranged.
Premise: Slayer is the only career/hero in both games to have NO ranged weapon. Because of this, he should objectively be the best melee DPS in the game. It isn’t a compromise with him, not a middle ground, not a balance. He needs to be, by any measures, the best career in a melee scenario. If you agree with that premise, then the real question is: Is slayer the best/highest damage melee career? I would say he isn’t.
Problem: Slayers are encouraged, by the class description and associated weapons/talents, to be aggressive. They are encouraged by the lore of the Warhammer universe. Yet, when a slayer actually plays like a slayer, they end up on the floor and annoying their team. The slayer gets unique Dual 1H Axes, which are an amazing single target/armour/elite/boss weapon. However, they aren’t good at all for hordes on anything above Recruit. Low cleave, short reach. Slayers tend to use these axes during waves and taking chip damage because of the lack of crowd control they offer.
The solution to this problem right now? “Git Gud” nonsense, and the use of a 1H/2H hammer in the second melee slot (my preference, 2H hammer). As a result, the slayer is forced to spend at least half of the match, if not more, doing charged sweeps with a 2H hammer. With any other career (Ex: Mercenary Kruber) this would be perfectly fine, charged attacks followed by blocks and back-dodging are a good skill to learn for higher difficulties. However, the slayer has passives that encourage FAST uninterrupted attacking that has to stack for damage. Your stacks don’t persist between charged swings of the 2H hammer (too slow) and you end up not feeling like a slayer, but like a Mercenary Kruber without any of the actual benefits of playing that career.
In summary, in order to survive a match the slayer is forced to play in a very un-slayerly (yup) fashion. He spends at least half the match doing charged 2H Hammer swings, not taking advantage of his career skills or the actual fun of dual wielding as a slayer. People end up doing 1 of 3 things.
1: Play the meta and use the hammer just to survive (why even bother playing slayer?)
2: Decide to have fun, use the Dual 1H Axes, get chipped by crowds, annoy team.
3: Simply not play slayer
Solution: Dual 1H Hammers for your second slot. Garbage against armor, as amazing as you’d expect against crowds, good stamina. Takes advantage of the attack speed buffs as well as stacking damage of the career, while allowing the slayer to actually take care of crowds in a way that makes him fun to play AND effective. No more using axes for crowds and dying, no more using charged hammer the entire round like a Mercenary. On any other career, access to both of these kinds of weapons at the same time would be OP since they are capable of handling anything. This is not the case for a character that doesn’t have any ranged weapon, and thus is justified for slayer. The community seems to agree that ranged is very strong in this game. If that is the case (and it is), then the exclusion of ranged from a career must then be a severe handicap, and must be compensated with something equally powerful. Can’t have it both ways.
An almost necessary addition to this would be invincibility frames during leap and for perhaps a second or 2 after he lands. As of now, most people leap roughly at their own feet because it’s too dangerous and risky to actually use the skill offensively. I know this one has been mentioned to death, but I figured I’d throw it in for good measure.