There's nothing really wrong with this lens. It's a solid performer across the range and the VR helps a lot if you need to shoot at slower shutter speeds. Focussing is silent but a little on the slow side for me. Sharpness is fine. It doesn't set the world alight with it's image quality but then it's not supposed to. Build quality is solid but plastic as you'd expect at this price point.
The main question really is why would you buy this lens? If you have a DX/crop body then this isn't the sort of lens you should be looking for anyway. And if you've taken the time and spent the money to go FX then should you really be gimping your camera with a cheap piece of glass that just does OK?
And therein lies the problem for me. Is it worth nearly £400? Well if I really really wanted a new lens then yes. Compared to it's competition I guess it's fair value. But personally I'd rather either save a bit more and go for a f/2.8 lens. There are plenty of decent ones second hand if you cannot stretch to new prices. Sure you'd lose the VR but personally I don't think that is a must have for this sort of range.