Did both you and the person before you forget to reset your camera settings?
SHAME!!!
Luckily for you, you can fix this rather easily.
HOW TO BATCH CONVERT RAW FILES TO JPG:
1) Open Photoshop
2) Go to File > Scripts > Image Processor. You'll see this menu:
3) Select the folder that contains your RAW files and select the ones you wish to convert.
4) Select the folder you wish to export the JPGs to. (You probably just want the same folder).
5) Under File Type, set the JPG quality to at least 8 or even all the way up.
6) SAVE the images as JPGs.