The primary reason I think tk is bad is because he makes obvious mistakes unique to team games that are far below someone at his skill level, and doesn't even realize it despite trying to explain him to him many times over the years. I don't like playing team games like two separate 1on1s, I like working together with my partner. It's frustrating to me playing with allies that don't make an effort to be better then the sum of their parts so I just flat out don't like allying him.
Challenging me to a singles series in response, or cherry picking examples just further reinforces exactly what I'm taking about.