The last maligned contract* of a Seattle third baseman was for Adrian Beltre, who in December 2004 signed a five-year, $64 million deal with the Mariners. Beltre posted 16.1 fWAR, valued at $88.3 million, in five years with Seattle, including only 2.2 fWAR, valued at $14.0 million, in his final season.
Beltre left Seattle for a one-year, $9 million contract in Boston, where in 2010 he posted 6.4 fWAR, valued at $38.7 million.
The future Hall of Famer played eight more seasons in Texas, where he posted 36.3 fWAR, valued at $276.2 million.
Career trajectories are hard to project.
https://www.fangraphs.com/players/adrian-beltre/639/stats?position=3B
* on second thought the most maligned contract for a Seattle third baseman went in December 2009 to Chone Figgins, who in 308 games under his four-year, $36 million contract posted a negative 0.7 fWAR, valued at a negative $4.3 million