Past few years, Mullo has had a horror run with injuries. 2009 he was fit for the majority of the year & was in good form, made CvC, almost made Origin, lead us into the finals & got 10 tries to his name to add to the luxuries. 2010 & 2011 he's had some bad luck. Thing is, when he's fully fit he is usually playing well or brilliant. Then he gets the injuries, plays on injured & plays badly, misses games here & there & plays pretty poorly until he starts to recover fully again. He is injury prone. Now i'm not saying he shows that SOO form every game that he is fully fit in, but in those games he's usually showing off a good kicking game, long passing, line breaks, maybe a couple of shocking passes (but he's prone to that). Then in a game where he's on, he outclasses every halfback in the comp. He shows the skills of a good NRL halfback. When he's injured (most of the time) he's showing poor decisions & shocking passes & kicks put together.
My conclusion is that if he had a fully fit season, he would play consistently well. But coz he's injury prone, he doesn't get much chance to play on the field fully fit.