I thought the game was well umpired. I thought both challenges by Manua looked pretty vigorous to me. As a kiwi watching the Suncorp the game looks a lot more physical than the NZ game and a lot more contact is allowed by the umpires over there. (What about the blatant shove in the back Potgeiter got in the previous game that was not penalised but very clear to see on tv? For example)
In saying that a lot of similar overzealous plays by defenders, like what Manua does, are just let go. The league administrators need to ensure the rules are clear and consistently applied by all the umpires. Maybe they need tv replay options for the umpires, like they have in the nba. I agree with the person who said umpires have a responsibilty to act on what they deem/see as dangerous play, which they did in this game.