Latest release failed the tests (with some memory corruption yikes) even. Doesn't inspire a lot of confidence that it won't eat your photos.

But the v7 uses DNN from OpenCV for face detection that supposedly has 91% accuracy on CPLFW which is pretty good! So how come people here say it sucks?

Because many people test it once, and assume that since it's FOSS, the feature is not evolved over time.

I'm away from my desktop computer, but it wasn't half bad when I last updated its DB. I don't take much portraits, so I don't use that feature much, but give it a look when I can and update you.