I dont think we should excuse poor umpiring just because it doesn't affect the outcome of a game.
If a team wins by 20 goals, or if they win by 1 point I expect an equally high standard of umpiring.
The umpiring was acceptable on Friday night, but not great. There were 2 or 3 extremely poor decisions made.
By far the worst call was Clarke on Allan at a centre bounce. The players were wrestling and Allan lost his balance, then threw himself backward. I had a great view of the incident, the umpire was not even looking at the rucks when the contact was made, he was looking straight up at the ball. When he looked back down all he would have seen was Allan falling back with his arms in the air. Basically the umpire guessed that Clarke infringed illegally.
We're always told by the AFL that umpires only make decisions they're certain about but it's quite clear to me that several umpires often feel they have to pay a free kick even when they're not clear exactly who should be getting it or why.