Posted by caesari on 12/20/2011 9:25:00 AM (view original):
Basically, GB pitchers get more outs and double plays and such. While neither is "bad," per se, if you have a pitcher with a GB/FB rating of zero, he's more likely to get lit up in a hitters park.
I don't think this is completely correct, although (a) I have no hard evidence and (b) I used to think it was completely correct.
The out/hit decision is made early in the simulation. I think that high GB/FB does not lead to more plays on which there are outs-- I think it converts flyouts to groundouts. This is still good, because there are (a) more GIDP and (b) fewer sac flies. But if you believe the sim engine is similar to sim league baseball, the errors and +/- plays are made late in the simulation (that is, they are "outs" that are converted to baserunners), and the above advantage could be significantly negated if you had a much better defensive OF than IF.