Why is the driver side headlight in my 07 Saturn Ion much weaker than the passenger?

When the Ground wire for a light is not making a good connection, the light will be dimmer. You need to check the ground wire for the light.

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Could be a poor ground, but it could also be clouded lenses or reflectors in the assembly.

Run a jumper wire from the ground on that bulb to a good ground source on the engine. or battery if you can. If it brightens up, make that connection permanent.

the ground wire on that headlight is goofed up. it will have to be cleaned to ensure bare metal to bare metal contact witht the chassis. it probably has dirt/corrosion impeding the flow of the voltage.