Quality Starts are a recurring subject here on Brewerfan. My take: A 4.5 ERA is nothing great, but it isn't meant to be. 3 runs in 6 innings are a baseline from which performance can be measured. You hope that your starting pitcher does better than that (1 run in 6 innings, or a complete game shutout for that matter). You can make the argument about 4ER over 8 innings (also a 4.5 ERA), but you're arguing over a very minute case, and mostly missing the point of the stat. As I see it, the value in quality starts is as a measure of a starter's consistency. If you look at what % of a pitcher's starts are indeed 'quality,' you start to get a sense of how good the pitcher really is. I would gladly take a pitcher who puts up a quality start every 5th day, since I suspect they'll end up with an ERA well below 4.5 (either by giving fewer earned runs in some 6 inning outings, or pitching past the 6th inning) in the process. It doesn't mean that pitcher is going to win every time they throw a quality starts (Sheets was the veritable poster boy for Quality Start losses earlier in his career), but a pitcher who doesn't frequently put up QS's are either keeping your team from winning games, or putting additional stress on the bullpen (which generally leads to your team losing games over the course of a season). Put another way, it is the quantity of quality starts (or the lack thereof) that should draw your attention, rather than niggling over whether the 6 IP / 3 ER case is really 'quality'.