It's impressive how Nintendo can continue selling heavily underpowered processors to gamers and nobody complains.
With a handheld the most important number, to me, is battery life. I still feel that Nintendo (and Sony) could do more by using a more efficient or lower power chip and get a couple more hours out of the device.
Then again I do not care that much for graphics so perhaps my opinion is in the minority. There are several things I would change about the 3DS if I could but upping the processing power is not one of them.
I bought my 3DS for basically 3 games, and while the graphics don't compare to my phone or tablet, the fact that I can even have them in a portable form factor prevents me from caring that it's underpowered.