I think there's merit in home/away stats - moreso home though. Road stats are a crap shoot since guys are playing in so many different parks, but if your home park is hurting a guy, or he's really raking there, then I'd factor that in.
But as booger said, it's all about context. If your guy is hitting .215 at home, but facing a pitcher with a 7.50 ERA, you may still want to give him the start.