I can say some days ago i had 3 times in row malfs, all of them i was our biggest value on 10+ and specially on 2 of them my team tried to feed me and we didnt manage to make it work. To get an idea we had 1 suicider and 2 ppl not building 12 13 and i barely got like 50 gold out of all. That basically made us lose because i invested all my gold on malfs to try to get fed and didnt work... Instead of malfs i should have rr better units then i would be mid on send lvl ezpez.
Each strat has their risks. The risk of malf is that u invest too much on a unit that wont get u mid on a send lvl for the chance to get fed on mid, rlly hard to make it work.
I even think malf is a unit that can be ez free rred on lvl 1 since its not best roll i can imagine, its ok to make them in case u got some pro add (like accos or locks or muts...) but its not a game changer unit at all, at least not easy to influence the game with it.