I have always been obsessed with product photography. Every time I'm out taking landscape shots, I have to deal with the light I have while in product photography I get to control them light myself. Whether there is a bad reflection, a section of the product not lit up enough, or even a section lit up too much, it's all controllable.
Not only is the light controllable, but so is the entire scene. You can set up a black background with a black product and the only thing you will see is reflections of your lights bouncing off the product. Challenges like that are a lot of fun.