As many have commented here, the NL Central is looking pretty strong this year.  So, I thought I'd see how the three NL divisions have measured up against each other thus far (of course we're only a little over 2 weeks in, so this is a bit premature).    Here are the numbers ('combined' records are against the two other divisions only - excludes intradivision games):

WEST
West v. Central:  5-8  (.385)
West v. East:  10-9  (.526)
Combined:  15-17 (.469)

EAST
East v. West:  9-10  (.474)
East v. Central:  4-10  (.286)
Combined:  13-20  (.394)

CENTRAL
Central v. West:  8-5  (.615)
Central v. East:  10-4  (.714)
Combined:  18-9  (.667)