To be fair, one of those seasons was only 29 minutes long due to injury, and ended after a big-ass linebreak against Melbourne. I think if you forget about all the massive potential he's supposed to have his first grade performances are more solid than mediocre.
He's only played 31 games, he's not on big money, he doesn't miss that many tackles, he doesn't concede that many penalties, he rarely drops the ball (in first grade anyway) his metres per run and metres per minute are very good. Yeah he hasn't set the world on fire, but his appearances in first grade have been decent. I could understand thinking he's overhyped or not living up to his potential, but he provides more impact and go-forward than most other guys in his price bracket, and certainly more than the other guys competing for that last prop-spot for us.