she was good on ascent but there are no reason to run viper because kayo and skye are more viable. in brazil botafogo was using it instead of killjoy and couldn't get out of closed after 2 tries
she is must pick in 2 maps (icebox and breeze), is played along as another controller in 1 map (bind) and sees medium to no play in 4 maps(fracture, slipt, ancest and heaven)
If Riot makes his stim not only increasing the fire rate but reducing the delay on other agents skills it would make him viable, like making Jett dash + grab gun faster, Skye pop flash + grab gun faster, Raze rocket activation faster, etc
needs a hard nerf since her abilities already broken even without the buff. but this game is and look stupid if riot nerf/buff agents every few months. this game is doomed to die soon anyway.
If you really wanna nerf her the only right decision would be - delete poison spits and add smth new. Viper is a controler/smoker agent, she doesnt need mollies. She is not fukin anchor. So valorant becomes better game.