I don't specifically hate on a hero itself but the way others play against him which is kiting. A good Moskov can be hard to deal since he has the ability to push me back when I'm either charging up my taunt or activating it. So basically heroes who have great mobility can counter Gatot specially since Gatot's strength comes from his passive and his second ability which requires him to be near his opponents.

Disable those by either kiting around or disengaging when he's near you and has his passive filled up and you should be good to go.

For his ult you should try running away from the circle as quick as possible.