She still fills her role great imo:
- Great wave clear
- Can engage/disengage well
- Can easily get picks
I don't think we see her a lot right now because the meta just isn't great for Liss. The assassin change seems to have gone rather poorly and a lot of the assassins just aren't being play right now. I don't see a ton of Zeds, Talons, Akalis etc. Katarina is getting more play though, it's a nice pick vs her.
We are seeing a lot of mages right now:
- Lux, Syndra, Cassiopeia, Victor etc. All who do quite well vs Liss, so it's not really a great time to be playing Lissandra.
Still though, I enjoy her, and like I said she still performs her role well imo. I say her passive could use some work because it really only helps her in the early game. She has terrible mana issues early on which is why the passive is useful, but in reality you should be able to manage the mana of any mage you are playing, especially once you get some items.
It would be nice if her passive did something like add additional damage on rooted or frozen characters. Maybe empower her Q or auto-attacks if they are frozen/rooted.