She's not really garbage... that being said, the nerfs to her abilities were kinda harsh and unnecessary imo :/ I get that it's to compensate for the dmg the passive does... but the passive only activates once a kill is secured. I don't think she shouldve gotten those nerfs all across the board (aside from Q).
Basically.. the changes really nerfed her for the avg players and buffed her for high elo players... (the avg player is gonna be less reliant on group plays and dynamic, whilst high elo more dramatically revolves around how you work as a cohesive unit... less so about solo-carrying).
And lol, i thought the general consensus for Liss mains wouldve been to keep the old passive alongside the new passive, but guess not :/