My personal opinion is that the refs in the main spotlight are way too complacent about their roles. It has become too cliquey in the top ranks of refs. Chamberlain irritates me for several reasons.
1. His voice, listen carefully to the pronounciation when calling scores or players names.
2. He makes more cockerel ups than any ref (though Jan and Michaela are running him close)
3. He seems to think that he is part of the show, whereas a good ref should assist the flow of the game not be centre stage.
The incident in the Dott/Selby game was a horrible one and was handled (parden the pun) badly. In fact the whole game was handled badly by Chamberlain who seemed to think that because he was (is ??) from the same place as Selby that there is some sort of smug jokiness to be had. No there should be none of that. Its the biggest and most serious tourney we have.
It was almost a relief when he got the poops and could not ref another game from that tourney.
Overall I am not very impressed by Chamberlain or the other refs as I think their standards have dipped markedly.