I don't recall Giambi as superman in 2003, 2004, or 2002. Since he joined the Yankees he's been a waste. It was a bad signing in the first place, and most Yankee fans have been tepid at best about his presense. After 2001, when they lost to the Dbacks, Steinbrenner had a hissy-fit about losing and demanded signing Giambi and sending favorite Tino Martinez packing. That did not sit well with many a fan.
He's been average at the plate (although with better-than-average power) and a downright disaster in the field. Sending Tino packing was a big misktake.
The Boss is beginning to show the same desperation he showed in the early-mid 80's.
To my mind, the critical point in the collapse of the 26TWSCYs in the 2004 ALCS was the injury of Olerud. First Base is very important to the Yankees. They expect First Base to be a team leader, an example to the team. Olerud has the right attitude. Tony Clark does not. And Giambi is a disaster.