Cameron adds good defense and pop that could net him 25+ home runs. He strikes out a ton, but he will still put up an OPS+ in the low 100's. Long story short Cameron is an upgrade, but the team cannot be done improving the offense.
So, what should come next, you ask? The next moves to make this team work would be trading Matsui and signing Manny Ramirez. This would allow for a Damon/Manny platoon at LF/DH. We have seen a lot of media outlets endorsing Adam Dunn, but the signing of Cameron as a high strikeout risk negates that point.
So, in short, Cameron is a solid stopgap as the team awaits Austin Jackson but more needs to be done for this team to make a run at the division.