Re: Jerry Hairston
He's a run of the mill utility player, nothing more, nothing less. Nice 13th or 14th man on the roster. He's the reason you don't give Ryan Freel $3M. You'll get something around a .700 OPS with decent defense at a number of positions.
And if things go south (or stay south), maybe you can flip him for a C prospect with a bit of upside in July.
Games are won on run differential -- scoring more than your opponent. Runs are runs, scored or prevented they all count the same. Worry about scoring more and allowing fewer, not which positions contribute to which side of the equation or how "consistent" you are at your current level of performance.