Top division in baseball?

This week in John Dewan's Stat of the Week (which is often a quick and fun diversion, and is highly recommended reading), he looked at which divisions were the best in baseball by tallying up their records in inter-divisional games (including interleague). Here are his results:

Division	W	L	Pct.
AL West	137	118	.537
AL Central	154	137	.529
NL West	139	125	.527
NL East	129	135	.489
AL East	145	159	.477
NL Central	133	163	.449

I probably would have guessed that the AL Central would be the top dog, but the AL West is also a pretty strong division...

Is anyone surprised to see the NL Central at the bottom? ... makes the Reds record all the more embarrassing, I suppose..