My biggest issue with refs has and forever will be consistency.
I can't blame a ref if he didn't see the smallest of knock ons in a 4 man tackle from 10 metres away or if he misses a guy 10cm offside from a kick. Those happen to all sides and it seems to balance itself out.
But what sh*ts is me is the consistency in ruling.
One week a shoulder charge that hits the head is a penalty, the next week it's legal.
One game where a player offside on a kick gets within 10 metres of a try and it's allowed and another game 2 hours later and the same scenario gets called a no try, penalty.
A try is allowed like the one that young Hopoate scored against us where Williams tackled our players - sometime this season that same scenario will be called up for been illegal and be awarded a no try, penalty.
I don't think it's that hard to have a rule book to follow for all scenarios. It's couch potato science.