Jovetic is still a great player. It's just that when you play for a shit team for too long, you start losing interest. I'm sure with new challanges and motivation, he'll capture some of his pre-injury form.
Paradoxically, Jovetic lack of motivation is very good sign for us. He would be out of our reach if he played like a world class top striker this season. We will have a chance to purchase his card for bargain price (comparing to Della Valle demands from last summer) if he keeps going like this.