lifetime annotations seem to be the biggest yuck for most people, given it's the most un-C++ like syntax (and single-quotes are always balanced in most languages).
Single quotes are not balanced in GNU Octave or Lisps. I have never seen that as a critique of those.
I think they have more obvious syntax complaints (from the perspective of the C-syntax language developer), to be fair
That's what's always tripped me up learning VHDL. I still don't really like it.