I actually expected the weekend to be tougher, but in my case, I felt that the difficulty was quite similar to the previous weeks. A fair number of low-cost decks with only a handful being fully-optimized Control War/BWD decks.

Come to think of it, it's actually possible that the difficulty of Mythic matches goes down as more people try to stay in it even with less-optimized decks. But as always, sometimes you just get bad matchups or happen to play at the same time as people with their best decks.