In fairness to the spinners of both teams, I think the historic average of spinners at this ground is around 118! So no surprises really, clearly the track is even flatter than is usual there.
I personally thought the pitches for the Ashes were mostly excellent this summer and a good standard for English test pitches. Unfortunately pitches over the last 10-15 years have been so flat that techniques have changed and batsman are going to have to relearn how to play long test innings if pitches like them keep being produced (which they should be!). It's certainly possible, Root was making good tons on them after all. Standard of bowling from England in particular was very high too, and modern Aus teams can't play swing at all.