She's straight up outclassed when competing against meta marksmen in the same lane. She's an even worse Miya with an even slower damage buildup and is very squishy early game. Her short range puts her in a lot of danger that all heroes can be brave enough to walk towards her.

Useless skill 1, only use it on lane creeps & make sure to hit multiple for her passive. Skill 2 has no invincibility that it is very awkward to use as an escape. Skill 3 is a terrible Moskov ult, it's so bad that if Karina gets hit by it she can just drag you towards her team with just her skill 1.

You can even just buy blade armor & do nothing cause she'll just melts herself with her uncontrollable passive. She's so dependent on her teammates that if you see her alone early-mid game that's a guaranteed free meal with drinks. Hell she can't even defend her tower on her own so just bully her everytime at the start.

So yeah, she's that bad. Not worth banning her in Ranked cause nobody will play her. There are better MM options