Yes, that lens you mention may be useful. I have a similar lens, 18-200, which based on different sensor sizes gives the same field of view.
But of course
image quality is compromised with these lenses, otherwise there would be no need for other lenses.
Also, note that the aperture opens a lot smaller than other lenses on these super zooms.
On this page
Gordon compares the image quality from a superzoom to a prime, so you can see for yourself the image compromises.
A lens like this isnt designed for pin sharp images, its designed for ease of use, and those situations where you can only carry around one lens.