Tight passives are the easiest to outplay for me. I just stay the heck out of their way when they bet/raise, and if I'm isolated in a pot with just them I am always looking to steal the pot to any sign of weakness (if my table image allows for it).

Tight passives tend to do well in a lot of home games that are filled with loose aggressive and loose passive calling station type players...they wait for a hand and just value bet the loose players to death when they pick up a hand. Their style of play can be easily countered though once you get a read on them. Don't call pre-flop raises from a rock unless you've got the goods, and respect their bets/raises post-flop more often than not.