Melle weapons are in terrible spot right now as why would you use them if you alredy have weapon with who you can bash enemies dealing nearly the same damage, for me melle weapons have 5 major problems
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not enough damage not even the questionable heavy attack (right click) doesnt one shot zombie (dont think even on headshot).
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not enough range if you are close enough to deal damage they will always trade in which case it doesnt make sense to use it.
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bringing 3rd problem not enough knockback or stun mechanic as even if you hit enemy zombie they just stagger close to you and deal damage to you having no way of dodging/parrying that.
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cannot run andswing, it may come as a suprise but if you switch from long range weapon to melle you want to have some mobility to dodge or run away from enemies while also have some way of keeping them at bay or dealing damage without dying.
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which can solve all these problems, variety all weapons feel same, no damage difference no range difference nothing, should you add 1-4 of my points to all melle weapons, hell no but add one of them to each of the weapons and it will make all weapons interesting and not strong or weak.
this post is made with broken english and badly expalined details so if you dont understand one of my points or think its not good point feedback is apriciated and i shall edit or delete my post based on feedback.