Once you find out about using the Luminence curve in the RGB tab (you have to switch it from the RGB curve to the luminence curve) you'll see ACR has even fewer features over DPP than you thought. With the luminence curve one can reduce highlights and increase shadow detail by raising the bar at the top and bottom of the graph. You can even set white point. Problem is the features' ease of use are far greater in ACR. DPP is powerful - but ACR is a joy to use. I hope Adobe finds a way to decode CR2 files better in the future. I usually get better results in ACR. DPP is hit and miss - but when it is a 'hit' the results are better than ACR.
I think this is a really good point that a lot of people who have tried DPP are not aware of - and its one if its greatest assets. The ability to set the luminance curve in the RGB tab makes it ideal for adjusting curves.
Personally - I find the luminance curve in DPP far more intuitive than ACR - but that maybee because I have spent so much time with it.
I think its worth pointing out that ACR has to cope with all of the RAW file formats out there. DPP specialises to its own - its therefore highly unlikely ACR will ever be as consistent as DPP with Canon Raw files.
I would love Canon to add a clipping indicator to DPP [ive emailed them about it a few times] as I find the clipping indicator in LR to be really useful.