Riktor is still pretty trash imo. The chain buff was ok I guess, but that still doesn't make up for how terrible he is as a tank. Poor survivabilty with no escpape and a hitbox the size of mt everest, he gets killed pretty easily.
His abilities are so fucking slow its pitiful. Shock therapy is useful really on luck. Trying to actually coordinate it is a waste of time. By the time you actually acivate it, the enemy has already used their ability and you still need to actually hit them with it. Electroshock got a damage buff since legacy but its still extremely useless. And last his ult. Fucking useless. Ok that's a bit of hylerbole but still. Basically, take Steel's ult and water down until its rusted into nothingness. It does less damage, can be interupted, forces Riktor to put his fragile self into dangerous positions to actually get full effectiveness, and an overall decrease in effective and activating range.
TLDR; Riktor has transitioned terribly since Legacy. His buff did minor help and he's extremely slow. Just take Steel.
Edit: This was a bit of a rant because I loved riktor in legacy. If I see a riktor on the enemy side I want to shit my pants. Instead I'm like oh free farm.