I think the quality of DPP is a sight better than Lightroom, especially for underexposed (high ISO) images. I really like that NR=off really means "off". (Whereas in Lightroom, NR=off means "a little less".) I also really like time-saving features like automatic falloff correction. However, I think it introduces a more demosaic artifacts (e.g. maze) than other converters, but they're not noticeable in most shots. One thing that really annoys me about DPP is that it doesn't implement 1/3rd stop ISO correctly. Those ISO settings have different white points (i.e. "highest number possible") than normal ISO, but DPP uses the same white point for every ISO setting, so it completely misses the very tippy top of the highlights in 1/3rd stop ISOs (whole stop ISOs are fine). It's only a small amount of highlights, but just the idea of wastage just bothers me. (You'd think that if they're going to mess up the camera by changing the white point for each ISO setting that they would at least handle it in their own converter correctly, but oh well.)


Also, as demonstrated in this thread, I can't figure out how to control clipping caused by color space conversion in DPP, but there's probably a way.