A big deal was made about team work, but yeah, it hasn't been shown since the second exam, but the think to keep in mind here is that, even though a lot of episodes have passed, there hasn't really been a lot of major events. Since the end of the Zabuza thread, the opportunities to see team work were: the second exam, the chase and fight with Gaara, and....that's it. There was kinda some team work in the Gaara chase, when shino stopped Kankuro so that Sasuke could continue with the mission. The reason there wasn't any teamwork in the actual fight was cuz Sasuke had already gotten owned by the time Naruto made it there. So...yeah.. not that many opportunities to glorify team work.