The one thing people won't like is how he comes across in the media and interviews. He's not comfortable doing media work at all and comes across as awkward (even more than McD) and a bit dry, almost abrupt, but I pressume Sinfield will pick up this element and still be the face of the team.
If anyone watches his recent interview on NRL360 followinf his sacking where he gives his side of the story, you'll see that he's a thoroughly decent bloke who's stood by his principles and not bent over for Gould. His players love him - Gould has claimed he lost the dressing too., but this is already being proven to be wrong. The players he's fallen out with in the past have been idiots or loose off the field (Moylan, Segeyaro, Soward) - they all copped the treatment they deserved.
Hats off to GH on this one I reckon.