I think the real problem lies in the camera's software. The actual performance of the stock application is garbage.
As I said, it seems that the pictures Vignette takes are significantly better than those taken with the stock app, and that's just with the, "Auto," settings. If you apply any variation of settings in Vignette, your pictures can turn out even better. If I remember correctly, you can combine certain settings and/or effects to create custom ones. Just tinker around with it a bit and figure out everything that you're able to do. You can buy the application and return it within 24HR if you don't like it, for a full refund.
The Vignette UI is more functional. Whether or not it's more esthetically pleasing is up to you. I think it looks just fine.
Also note that apparently, the 8MP setting in the stock camera application is what it says it is, but the 6MP option is actually an 8MP shot. It's just been cropped on the top and bottom to give that widescreen effect. while still keeping the higher resolution. I don't know this for a fact either way, as I haven't bothered to check myself, but that's what I've read from users on here repeatedly.