RE: "Xin will be pick/ban every game."

They're giving Shen the ability to have allies dodge attacks for twice as long as it takes Xin to Q.
There is no problem if you just pick correctly.
Edit: Clarification.
- Shen also has a Taunt, which will completely nullify Xin's burst if he uses it along with the dodge on himself.
- The placement of the sword for the dodge will be Shen's job. He shouldn't just expect the ally to be in its range when he didn't make an effort to put the sword on them.
- Xin cannot ult his auto attack target out of the field. His ult specifically doesn't work on his marked target.
There.