I concur. DxO is especially good for getting the most out of less than perfect equipment. Take a good raw file from a 20D and even the lowly the 18-55 kit lens, and DxO will knock your socks off.
With higher grade lenses, and more recent sensors, Lightroom can get a lot closer to DxO, but I still run anything I'm going to print through DxO first, then do printing, cataloging, etc. with Lightroom.
I haven't used DPP in years. Last I tried, it produced very nice raw file conversions, but that's just about all it could do. It didn't have the organzing tools and unlimited nondestructive tweaking capability of Lightroom, or all the lighting manipulation possibilities from DxO. But, I haven't tried recent versions, and they may have improved since then.