For the most part I like Houdini for hard surface stuff. It helps to set shortcuts. I have all my most used operations bound to extra buttons on my mouse.

But yes, modeling is neglected. Not so much the operators, but the workflow. The problem is, few (very very few?) people use Houdini for traditional modeling. Which means SESI doesn't get much feedback, and there is probably not much pressure from their customers to improve the software on that front, compared to the vfx tools.
Works for both characters and hard-surface modeling.
Hmm, idunno. A lot of the hard surface stuff I've seen from sculpting apps looks like it suffers to some degree from blobs-with-creases syndrome.