I concur.
The Canon kit lens is excellent for starting out with. It can be impressively sharp, and is pretty versatile. The only real downside of it is that its too slow really - f3.5-5.6.
I had good results with mine, but shifted it because I managed to pick up a Tamron 20-40mm f2.7-3.5 for £70 (yes, it really is f2.7). While the Tamron is generally quite a bit sharper, it has weird ass distortion at the wide end, which the kit lens did not. I can happily recommend the 18-55 on the basis of its value, which is quite incredible really.
I've also owned a Nikon D100 (20D at the mo), with which I used the 18-70mm. It's an extremely versatile lens, and is definitely better than the Canon kit lens, and by a fair amount. Focusing is quiet and fast, and distortion is pretty low too. Not sure on the Nikkor 18-55 though, I haven't tried one of those.