He went on to win nine games in 2004. Just like in 2003. And while 2005 was a nice breakout season, now he's coming off a 5.01 ERA. Nice.
Beckett is the prime example that comes to my mind of a player in a fantasy sport who became overrated from a previous postseason performance. But it happens in other sports as well. Think Troy Aikman in football after the Super Bowl wins.