It's one of the finest 300mm f4's out there to be honest, and will be fine for wildlife photography.
It's a very sharp lens, and not too big or heavy.
Depending on what you're photographing though, you may find 300mm a bit short! For small birds, you'll have to either be very close, or need something longer.
You can use a 1.4x Teleconverter on it without too much loss of image quality though, so that would give you a 420mm f5.6.
I've got this lens, the Nikon 70-300 f4.5-5.6 VR, and a Sigma 100-300 f4.
Of the three, I use the Sigma the most, as although the 300mm Nikon is good, it isn't any better than the Sigma, and the Sigma gives me the option of zooming back out to 100mm if I need to. It also works well with teleconverters.
If you're just starting out, the 70-300mm Nikon may be something to get to test the water with. It is an astounding lens for the price, and has VR as well which is useful in some situations. It does work with non-Nikon TC's, but I wouldn't recommend it unless you need the extra length. Image quality wise (and I know all the technical tests show it to be less sharp/contrasty than the Nikon 300mm...), you might be hard pushed to notice much difference, especially in good light. The f4 of the Nikon prime will be useful when things get darker of course.
So, what am I saying?
Basically;
Nikon 300mm f4 = excellent lens
Sigma 100-300mm f4 = excellent lens & more flexible
Nikon 70-300mm f4.5-5.6 VR = Very good lens, and a bargain to boot...
I haven't got any pics with me at work, but can post some later if you like. You won't be disappointed with it if you get one, just be aware that there is that Sigma as well, or the baby Nikon zoom if you want something light and good value for money whilst giving good image quality.