Bad enough to require surgery almost immediately now that the season is done.
Having said that, Opacic displays a number of glaring weaknesses in defence. He plants his feet very early, allowing players with footwork to get on his inside and outside quite easily - E.g Justin O'neill Try.
He also arm grabs quite a bit because of this early feet planting, hence the Coen Hess try.
He will get his surgery and this will be a massive issue for him to rectify, or he will slip into a depth role in 2017 with Mead coming.