Those are "lowercase" or "oldstyle" numbers; they are built to go with mostly-lowercase, running text. I think they look odd with sans serif fonts and anywhere outside of blocks of text, but completely and totally wonderful otherwise.

I love old-style numbers.

Why should letters get all the ascender & descender fun! :P

Agree completely!

I think they are artistically wonderful! It all depends how you perceive things, isn't it