FWIW I would not (but I have financial freedom to choose solely on performance, need, etc). I have one, but now that I have my 17-55 which is stunning and my 70-300 which is also pretty damn impressive my 18-200 is semi-redundant. My 11-16 is pretty good too for the wider shots in lieu of the 17-55.
When I originally got it when they first came out I was looking for a good general purpose lens with a wide range to pair with my 105mm Micro so I could operate with a simple 2 lens setup. My logic was to replace my original D70's 18-70 lens to give me some reasonable zoom (I sold that lens with the D70 & now regret doing that) without having a third lens. Ironically I then bought a 50mm prime a year or so later!
I would say 18-200 VRII version is well worth getting if:
1. You have to only have 1 General Purpose lens, and/or
2. You are limited financially and want something to cover medium-wide angle out to a good zoom range.
However, otherwise you could be better served with 2 lenses or more, if no financial constraints & you don't mind the changes $ carrying additional lenses:
1. Get a good fast sharp wide like the 17-55, or 11-16, or 12-24 as your main walk around lens.
2. Depending on how much zoom work you may need pair with a good zoom like a 70-300 (Nikon or Tamron) or to keep cost down (or if usage will be low) the Nikon 55-300 kit zoom.
3. If needed you can add a good prime later for that sweet spot in between the two (you will need a 35mm for that on a DX format camera, but a 50mm may suffice), something super fast if possible (f/1.4 or f/1.8).
The 18-200 is an awesome lens for its price, but as you expand your boundaries you may find its too much a Jack of Trades and not enough a Master of any One.
I'm keeping mine, just for those odd times I go light with a camera & single lens and no bag, etc... But it isn't my go to lens anymore (that's now my 17-55)...
Just my 2 cents...
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