I do tend to agree that the alignment chart isn't the best categorization of characters, but its still fun to apply it, so long as we don't try to live by it...

In Lana's case, I'd say she is a bad person with good goals, at least at this moment in time. But that may change in the future, depending on how things go... Her goals might change, or her moral compass might start to be less oriented towards practical over honorable, but we wont know until it happens. World shaping events are occurring, and its likely they will shape the people that are causing them.