I'd have liked to see Katya with someone with potential. Phil had a bit, but only in ballroom.
Katya showed Phil exactly what he had to do to get the tango right, but every time she showed him the power and dominance she required of him, he just giggled. I was impressed by how she tried to teach Phil and Gavin - she was very insistent, but also flexible in her approach, so I think she is a good teacher.
She never really got a chance to show what she could do choreographically because you need a good enough celeb to show your best stuff - like Flavia was able to do with Matt, or Vincent with Rachel.