"Uninteresting" or "dull" are potent pronouncements and muscular writing, but dangerous critical terms. I had a discussion with another critic about an NYCB ballerina. He said she was uninteresting. I found her very interesting. There isn't much place for the conversation to go after that, is there?
There is nothing really I can add to this, except to say I agree completely and wish all critics would take such things into consideration when writing their reviews. At least, if one is going to use those terms, they should explain in what way or for what causes, they see the performer as dull or uninteresting.
I also think it a mistake, in a critics first review of a performer (at least in their current job) to proclaim a dancer boring or uninteresting, as it gives them very little room to grow in their appreciation of that dancer. Every review afterwards is going to be read knowing "oh X dislikes dancer Y". Though I have to admit, it is certainly intellectually honest!