As far as the rule changes for Stats - I think it is a serious thing, because there are supposed to be serious penalties for low charisma and wisdom, but as there are not one or the other can be safely dumped to 3 to boost other stats -You should never have been able to make a 3 wis 3 cha character in BG2 without some serious penalties according to adnd RAW, but actually thats fine to do that, allowing you to easily have very high str, dex, con from starting etc, even with a low roll, *shrug*. Again, its not a big deal for me, but saying that changes to stats rules doesn't effect game balance is impossible imo