I think Lissandra is a tad overpowered, considering her relatively good CC combined with mobility.
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Granted, she's hard to play, but that doesn't justify her monstrous power when she's used well, which is nigh unstoppable.
After playing both as her and against her, I've noted that the only way to really stop her from using her E to catch up is to interrupt her in the middle of it; and since she really only uses it to chase, and since the E is relatively fast..., yeah that's a problem. Once she's gained on you, she only needs to land her slow/stun with her Q and ultimate and then you're a sitting duck; sometimes literally. Her ult seems balanced when self-casted, but when it's used on you in a teamfight, you're a frozen chicken for the enemy team to slaughter, and the ice pool around you is only causing trouble for your team.
I think the problem is that at later levels, her ultimate and Q have low cooldowns considering their power, which means it's easier for her to stun and slow you, which, combined with her E, makes it so that she's able to engage far more often than she should be able to.
It's the sort of problem there was with Darius on his release (although FAR less extreme; since Darius's case is... yeah...); once she gets a couple of kills, she starts rolling into, ironically, a pretty big snowball that can engage and disengage on a whim.
This might be only a problem for me, but that's just my opinion.
Is there any actual way to counter her?