Number 1: game scores. This is to a pitcher what a speed figure is to a racehorse. When you look thru the pitcher's seasonal log, sometimes a couple horrific outings can wreck year to date stats and distort what a typical outing is. Some of the advanced stats have their use and you can customize thru Fangraphs. For instance if you want to see a pitcher's ERA and XFIP in his last 8 starts, instead of full year to date, you can.