Funny enough, if your team lets you, Karma can absolutely crap on Top Lane.
She's a strong counter pick against mid lanes with no shoving potential and she can run Morgana into an infinite farming stale mate.
But top lane is where she can shine. Her problem mid lane is she's outranged endlessly but up top she has a speed up for escapes, a slow down for chasing, a ridiculous shield, and endless sustain.
Every time an enemy goes to last hit a creep you Mantra+Shield it and take his last hit AND put out damage. She can outplay quite a few champs.
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Realo won gold at the Sex Olympics with a BROKEN FRIGGIN NECK.-Voltch