Sure he is a decent defender
No, he is an exceptional defender. He has been an NRL quality defender since he was 18 years old. He has only gotten better at it as he's matured.
but I am yet to see the great attack whether in the middle or on the edge.
Well he's not a great attacker, but he is certainly good enough. If he played 80 minutes out wide he would make plenty of line breaks.
Sure the occasional but good run, but even a slug attacker makes a bust here and there, especially if given a great early ball.
Do you even watch the game? Early ball makes it harder, not easier, to isolate defenders. Early ball is what you give to playmakers so that they can attract defenders and set up their supports. If you want an attacker to run at an isolated defender (like Kikau vs Moses on the weekend, or Moeroa vs Fuimaono against Souths last year) then somebody needs to draw defenders away. That's a playmaker's job.
I don't want to keep bagging Moreoa. I think everyone here knows my feelings on him by now. Lets all just agree to disagree. The only reason we predominately use him in the middle is because he was found wanting when we first used him exclusively on the edge.
No, it was because Arthur likes to use playmaking forwards on the edge, and Edwards (and now Takairangi) aren't reliable defenders over 80 minutes. So Moeroa gets those first 20 so Edwards/Takairangi don't have to play 80.
I haven't closed off my feelings on him. There is still time on his side to change my mind. But it ain't looking good for him in attack. If he doesn't pick up his metres to around 130+ a game and some of those being open breaks in the clear, then he will not warrant a hefty renewed contract. I believe he is already on 5-600k. For that sort of coin, I expect the player to be very good, especially in attack and domination of the defense. At the moment he doesn't dominate the defense when carrying the ball.
The only person who dominates the defence in the middle of the field is Jason Taumalolo. Moeroa made good metres on the weekend but he's not a battering ram. He is a mobile hole runner with good speed and work rate. He is a good first grader who hasn't been to blame for any of our losses since about 2014.