I think one of the biggest positives so far has been our defense.
Before any games were played, I thought we definitely needed another central defender, but now I think we're set for this season. Okore is sooo good, and Vlaar is, well ok, beside him. If Vlaar starts slipping or gets injured again, Baker and Clark are capable to fill in. Especially Clark looks improved from last season.
Our LB position is very much improved by Luna. And I believe Bennet will do fine when he needs to step up. He's ok when there's not too much pressure and can continue to develope.
Lowton has surprisingly been the sleeper so far, but I have total faith in him when the level of our opposition gets down a notch. And Bacuna should be ok every now and then.
All this has calmed our defense down a lot, and brought stability to our game.