Since I have been a fan, there have been several players with huge expectations in the Red Sox minor league system. Some of these players, such as Mo Vaughn, Nomar Garciaparra, Trot Nixon, Jon Lester, and others meet those expectations. Others are not as fortunate.
The Red Sox have had some troubles developing catchers since the early 1980's when Rich Gedman emerged. Since then, John Marzano, John Flaherty, Eric Wedge, and Scott Hatteberg all came from the Red Sox minor league system, none of whom made a single All Star game with the team. Steve Lomasney was supposed to change that. He was hyped to be the second coming of Carlton Fisk.
Lomasney was rated the #50 prospect in all of baseball prior to the 2000 season. He had hit 20 home runs and .259/.390/.482/.873 in two stops in 1999. However, in 2000, he started to slip and never came close to those numbers again. He finally made it to AAA Pawtucket in 2001 but continued to struggle. He bounced between AA and AAA for years, never quite making the leap for good.
He played one game in the Major Leagues with Boston in 1999 and was hitless in two at-bats with two strikeouts.