The P600 is capable of taking very good photos, though every camera has its limitations. In this case, photos just come out of the camera looking a little soft and definitely benefit from some post-shoot sharpening. Also, though fine details look OK at full size at ISO 100, there is a noticeable loss in quality above that.
But, if you don't typically enlarge and crop in tight on things, this probably won't be much of an issue. It's only really disappointing if you want to take a closer look at something, such as a bird, and you might lose a lot of the feather detail.
For however good the camera is with a lot of light, it's not a camera you'll want to use at higher ISOs. Things take a turn for the worse at ISO 800, but really it's above that when details really start to look smeary and colors desaturate.
Though the lens stops at 1440mm (35mm equivalent), Nikon added an enhanced digital zoom called Dynamic Fine Zoom. It works pretty well, but like its regular images, you're not going to want to use them for anything at full size. View at full size.
This was taken using the camera's burst mode. The camera can take up to seven consecutive shots at full resolution at 8 frames per second. Unfortunately, once it's done shooting you have to wait about 30 seconds before you can shoot again. Also, focus and exposure are set with the first shot, so if you're subject is moving quickly, such as in this shot, all of your pictures might not be in focus.