The balance your referring to is mixing solid defence with quality attacking players. The Barca lite years, we lacked the defensive stability to hold on to a 1 nil lead. We look a lot more solid now and certainly did last year but the creativity and goals weren't anywhere near the level we're used to seeing.
Ozil is a good addition. Did Man Utd really need RVP last season considering they already had Rooney, Welbeck and Hernandez? It's like saying they shouldn't have bought him because they had Rooney. If we can't effectively integrate him into our team when we're lacking in quality in so much areas then we have serious problems.