39 year olds with 4.65 ERAs over the past 3 years are not wily veterans. They are last chance signings. The type of player you invite to Spring Training as a favor (hey Jeffrey Hammonds! Want a trip to Florida?) Where as Matt Capps was a decent gamble, a young reliever who had an off year last year but was dominant prior to that - most likely caused by overuse in 2006 and 2007. Guardado isn't. If the Nats truly feel they need that second FA bullpen arm - this guy ain't it.
Still - assuming it's a cheapy signing it would be a minor complaint. This has to have been a nice holiday season for Nats fans. I'll probably be out for a while. Merry Christmas! Enjoy your forced time off of work no matter how you spend it!