Also, keep in mind that all of those warnings about luck also apply to ERA. ERA is a much better measure of a pitcher's performance than wins or losses, but it still isn't perfect. This is especially true this early in the season, when we're trying to judge a pitcher's skill by just eight or nine starts.
Although Voros McCracken's theory wasn't as absolute as it sounds, the basic idea is still as true as ever: if you want to learn about a pitcher, look at walks, strikeouts and home runs. If you look at those numbers and put them in context based on the situation, they'll tell you 80% of what you need to know about a pitcher's performance.
And here's the perfect example:
J. Lester (L): 4.1 IP, 1 BB, 6 K, 1 HR. This tells you how well Lester pitched. The 10 H and 8 ER, on the other hand, are a reflection of the defense and the luck as much as Lester. Something to remember the next time you're browsing the box scores.