I see lots of decent argument but also lots of "nerf" crying.
Dracane has good point of malacath synergy with proc sets. Its not bad idea to find some solution in that direction rather than nerf it to the ground like they did with thrasian.
But to people crying to much about proc sets like red mountain, caluurion, plague slinger, widowmaker, pilar of nirn... They have delay and Im fine with it. If they have counterplay i dont care.
There was someone earlier in thread saying that he will charge you with plague slinger, velidreth and pillar (or widowmaker), I say please do. Just attack me with all that delayed procs with area of effect i can walk out of.
On other hand venomous and this new charge set with huge dot (and similar, sets) are real problem. And hopefully will be toned down.
Right now in bgs most of the people running proc sets (specially venomeous) think they just need to attack and sets will do the job, and most of them die easy. But when you find decent player that can pressure you with regular dmg thats when procs shine.
It has to stay viable way of play, just not as easy. If they have some condition, delay or something that gives you chance to counter it that would be fine
Edit:
About Malacath and proc sets, yes this item shouldn't buff these. Except of that it's ok. more details: When I did parses it slightly gave more damage than without it, but the difference was less than 10% in total DPS and I don't play any high crit oriented build, in noCP I have like 10-15% crit chance and 10% more crit damage above standard 50% (from passives). Effects? ~1k DPS difference. It's better with it but I haven't became some kind of godlike killer with Malacath and TBH I don't care will values of Malacath be nerfed or not, if it will it won't be worth to use. The only reason why I'm against nerfing it is that it adds some options. Nerf Malacath values and it will become another unused set like many in the past.