Fundamentally, the answer to this question is no. For the average consumer Photoshop (the full version) is probably overkill. Photoshop is a great program, no question about it. When Adobe introduced Photoshop in the early 90′s there was one main competitor already on the market. However, most people would be hard pressed to remember the name of that product/company. Since the introduction of Photoshop, Adobe has continued to improve the program so much that those other guys? They vanished. This is not only because Adobe has become a giant in and of itself, but because they have actually produced a product people like!
But as previously stated, for most people, it’s overkill. If you need to do a lot of manipulations or serious changes then Photoshop is your best solution. However, the average photographer often just needs to do a little bit of cropping and a few color and contrast adjustments. All of this can be done in Photoshop Deluxe or Lightroom. Unless you want to seamlessly make an image of your friend skiing down the ice cream slope, there really isn’t a need for Photoshop. Photo Deluxe or even Lightroom will do.