"Huge zoom range, compact and very good quality"4.5 starson by ben2ee
Pros: nearly ideal one-lens setup, Huge zoom range, compact and very good quality
Cons: Expensive, backward zoom motion, occasional focus problems
Summary: As the review points out the lens has flaws here and there but is a terrific solution for someone who wants a single lens for their SLR. That's the reason I bought it and I'm quite happy. Most of the time I use the camera, I usually don't have time to pick out a specific lens. The 18-200 allows me to grab the camera and go. Paired with a D40, it's a fairly compact solution for an SLR. The range is just HUGE. I can easily zoom from where I'm standing to my subject without moving. You'd really have to be a wildlife photographer to need much more zoom. Same goes for the wide angle although I can see getting something wider.
I had a Canon 20d with the 17-85mm zoom. Bigger body but smaller lens. I find the Nikon solution far more portable but I can't say I notice a huge difference in the photo quality which I think is in the Nikon's favor.
Call it a lifestyle lens. For it's flaws, most reviews I read dpreview, KenRockwell, praised the quality despite the flaws. I admit I'm not dedicated enough to always have the right lens on the camera for the occasion that pops up. I love having the SLR and the quality of the shots it provides and with this lens. When I did have multiple lenses, which I did until recently, I just didn't end up using most of them, even when it would have been more appropriate. I don't think I'm giving up much for the great results I get.
I can't definitively blame the lens for this but I do get my share of shots which aren't in focus. If the subject is moving, I still haven't perfected getting higher percentage of good shots.
I'm quite happy and would buy it all over again.