I don't really like the Skylar character either, but I don't think it's an acting issue. We're not supposed to be enamoured with her. While it would be nice if she could just embrace the criminal life and become the Bonnie to Walt's Clyde, it would take away from the little bit of realism that they need for the show.
She is the one negative variable that Walt has no control over and as such, she can ruin the fun at any moment. The show needs that mystery and tension I think. It can't all be cops and robbers.
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"A pessimist thinks things can't get any worse. An optimist knows they can."
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