Photos from the W330 are good to very good depending on how critical you are about picture quality from a $170 camera. There's a noise/graininess that's visible at all ISO sensitivities when images are viewed at full size. However, it doesn't have much of an impact below ISO 200. Go to higher ISOs and you start to really lose fine detail and subjects get fuzzy and lack definition. At small sizes photos up to ISO 800 are usable, though. Colors start shifting above that, and combined with the noise and noise reduction, I just wouldn't count on using ISO 1,600 or 3,200.
Of course, the downside to all this is that despite having a 14-megapixel resolution, you won't be able to crop in that much.