It was a great game for the defence and as you say a really interesting match, but I do think it was played really safe and pretty robotic. There's so much based on completion rates and not making errors, that they also seems scared to try things. Even with Wigan down to 12 men twice it still felt like going through the motions of complete high, no penalties.
It doesn't help that Wigan and Leigh are two best teams fitness wise so neither tired which usually would happen in the game like that. One of those would of run away with the game in the last 20 again most other teams in the league.