Lookout Landing makes a pitch to the Mariners on signing Prince Fielder:

Right now you have a collection of terrible bats. Other people make fun of your bats. Behind your back, they laugh at you. The inadequacy of your bats is all over the internet. Even Steve in accounting thinks it’s funny but also a little sad and depressing. Your bats can’t even hit seeing-eye singles. You have blind bats; blats. Write that down.

The Mariners were dead last in runs scored in the AL. The pitching did well, allowing the fourth fewest runs. Usually, when one half of the team is really good, the other half just needs to be around league average to get the squad into contention. Fielder would certainly move them in that direction.