I mained support before i played any other role so i learned early on to use actives (i still forget sometimes haha). Its really only meant for when you are ahead though. I started getting DFG because i was sick of Malzs ult being so weak, idk how it is so weak with its high base AND scaling. DFG Ult and Ignite is usually enough to kill someone though, if not throw on a E as they run for their lives haha.
I own all but Shadow Prince Malzahar, want nothing to do with it... I also dont own Snow Day but im considering buying it XD. Malz is super fun in all lanes, jungle is iffy, my favorite is Top though. 90% of the time its a melee person with little to no gap closer, perfect prey for the Void Prophet.
Personally though i think Malz needs a slight buff, and definitely some QoL changes. Unlike Katarina, who does a ton of damage regardless of how quickly you interrupt her ult, Malz does almost no damage with just his ult and if you interrupt it, he is useless until it is back.
Katarina's does more damage to a single target then Malz's and it can hit multiple people, then there is her resets and mobility.
Fizz's ult does a ton of damage, has a knockup, can hit multiple targets, long range, and with his mobility almost entirely impossible for him to miss (if he is good).
Syndra's just does a crapton of damage, targeted, and since she has stun it is impossible to stop it if she gets you...
Lux is super long range, does a ton of instant damage, and can hit multiple people.
Orianna's does a whole lot more damage then Malzs, can hit multiple people, pulls them towards the ball, and can be set up on another champion to set up awesome combos.
Brands will bounce to multiple people mulitple times dealing a shocking amount of damage, plus activates his passive which then can play off his abilities should anyone survive.
Why is Malz ult so weak when you have all these little to no counter play ults (other then dont get hit), sure it has a suppress but it also suppress Malz, meaning he is super vulnerable. Plus whenever you ult someone most of the time your team will jump on them while their team jumps on you, instead of your team leaving that kill to you and jumping on the remaining opponents...