Now, the Nationals might have the worst pitching staff in baseball this year. After all they improve by 0.35 runs per game and still be the worst. When you've been falling flat on your face for so long, just learning to break your fall with your hands is progress.
But if they're terrible again, it won't be because they gave up 10 runs a game in the first week of March. If you felt good at the start of the week, there's zero chance you should feel different now.
Some people say that spring training numbers aren't totally pointless. For instance, John Dewan has said that if a player posts a pre-season slugging percentage 200 points above their career rate, then that player can be expected the player to improve during that season. But first off, 200 points is a huuuuuuge improvement in slugging percentage--and that's to get any predictive value at all. Second, a lot of people think Dewan is smoking doobie on this one anyway.
So if you're feeling blue, just remember how much fun you had watching the Great Brad Eldred win his MVP trophy last summer.
- Update: I meant to link this post from last year by the SB Nation Royals blog Royals Review, which I think does a good job of summarizing the reasons I'm skeptical of spring training results.