Remember the good old days, when we were all moaning about Lucas being in our defence?
Lazio fans were moaning about having in defence too, but mainly because it means he's not in midfield. AFAIK they were still level in the Napoli game when he was moved back. Other than that, they've won every game he's played in. Other than his monstrous reading of the game (the most frequent adjective used to describe his most praised asset), they've also been surprised by how much quicker and more forward looking he passes the ball than Biglia, having been led to believe he was nothing but a defender. On the pitch they compare him to one of their old favourites (and hipster fave), Matias Almeyda, except that Lucas is a better technical player. Off they pitch they compare him to Miroslav Klose, whose signing dragged up the mentality of the whole squad. Before the signing they were doubtful about replacing their outgoing captain (Biglia) with a Liverpool reserve. Right now they're wondering why Liverpool let him go, and gloating over the best signing of the summer, with a similar view as Newcastle fans re: Benitez ("I can't believe we have him.")
On a more concrete note, he was subbed off in the last game with Luis Alberto, showing what Inzaghi considers to be his spine. Lucas at 6, Luis Alberto at 10, Immobile at 9, and the rest of the team fits around that.