Choose any metric you want, and the Giants are having a fine offensive season. The average National League team has 22 home runs; the Giants have 24. The average team is hitting .255, with a .327 on-base percentage and a .413 slugging percentage; the Giants are at .270/.344/.435. The average team has scored 97 runs; the Giants have scored 118.
That's all before you get to AT&T Park, which is covered by a thick soup of fog, seagull droppings, and our collective arrogance. We should have to use adjusted stats to prove this point. So far, we do not.