I know a guy who uses it for almost all of his shooting. I have seen some excellent shots he made with it. I have a lot more class than than that, so of course I shoot Canon!
But seriously, if you are talking about the 18-200 ED, it is a great lens and does things I never knew a lens could do. Canon has what I call an "extreme range" zoom in their L Series, but it is no where near as good as the 18-200 ED. My Kiwi buddy was in the US for a couple of months this Fall and was taking advantage of the exchange rate that swung in his favor. I tried to talk him into buying that lens, but he wound up getting a new tripod and a lot of other things. The ED glass is good, the Nikon VR system works well in the field, and the image quality is good across the entire focal length range.
If I were to have a severe brain injury that made me lose all of my good sense, then I would shoot Nikons and definitely own that lens. Just kidding, if soemhow someone swapped all of my Canon gear for equivalent Nikon gear, I am sure my photos would look exactly the same as they do now. Just a little good natured ribbing!
edited to add: when my reply posted I saw your signature line reads "come over to the dark side." The local buddy with the Nikon mentioned above owns a camera store. When I wa sin there with my Kiwi buddy, he was telling me I should swap all of my Canon gear for Nikon. I told him, " I will NEVER go over to the dark side!"
