Cleveland Indians. At least the Yankees were in serious contention around trade deadline. The fact that the Indians have a 22 (and counting) game winner in Lee and still suck this much only adds to it.
The Tigers have to be up there as well with the amount of talent they brought in to add to an already high payroll. As much as I dislike the Yankees, I don't think they are the biggest dissapointment b/c they were bringing guys like Ian Kennedy into the rotation instead of guys like Johan. The Mets will certainly be up there if they don't make the playoffs, but they're still in it as of right now (though they're playing like crap.)
I think Seattle. They were a good team last year and they added who they thought was going to be an Ace in Erik Bedard. They had some young talented guys like Felix Hernandez, Jeff Clement, Adrian Beltre, JJ Putz, Brandon Morrrow, and Roland-Smith. But they just totally tanked this year, I thought they would play decent because they always have Ichrio but it just didnt click this year.
Since this isn't limited to teams: Kennedy and Hughes for me. I expected 1 of them to post a 4 ERA, and not to terribly. I was wrong. I still have hope, though. Not too many pitchers have stellar a stellar first year.
3 writers had the Braves in the World Series 2 saying they were gonna win it. Braves just had too many injuries with Glavine, Smoltz, Chipper Jones missing time, and Tim Hudson. I went to about 8 braves games this summer they played pretty bad but Yunel Escobar and Jurrjens are going to be good players.
As a fan, I've been very disappointed in the Mariners, and getting more and more disappointed each year, but I have to give the team award to the Detroit Tigers this season. They were supposed to be even better this season than last.
The Tiggers. They made all those offseason moves (Miggy Cabrera, D. Willis) to be a serious contender and they find themselves WELL below .500 and out of contention for over a month now. As for the Yanks, I don't really consider them a disappointment. They've been plagued with injuries and as it is, most "experts" were thinking they'd miss the playoffs anyways. While I was hoping they'd make it, it doesn't surprise me that they're out this year.
The Pirates - I had actual reasons to hope for .500 this season and then they traded away 2/3 of damn good outfield.
Red Sox did the same thing the last two years and seems to have worked out pretty well for them. That being said, Clay Bucholtz had an atrocious rookie campaign. Command and, strangely, confidence were concerns. You'd think after throwing a no-hitter he'd have some damn confidence.
Yeah, but then the rest of baseball figured him out. That's how he lost his confidence, when he lost the element of surprise. Now its his turn to make adjustments.
