I haven't been very vocal in the threads about it, but I've been watching the show since the premiere and frankly...I'm not gonna miss Carter. She was interesting as an early "adversary," and probably worked best when she was an arms-length police informant for Reese and Finch, understanding what they were doing but still not approving of it. This whole recent arc starting with her and Beecher and the little war against HR felt like they kind of murdered the original purpose of her character and her final episode especially kind of drove me up the wall. Suddenly she and Reese are a thing when her apparent love for Cal Beecher had been her rallying cry to do whatever it took to take down HR to begin with? She just happens to mention offhand that she "figured out" that Finch has access to a supercomputer that cross-references media and surveillance feeds to predict targets of crime? It all just felt incredibly convenient.
Other odd character decisions in the last episode include Fusco opting for no reason to challenge Simmons to a fistfight rather than just shooting him (either to kill or just disable and arrest, which is what he did anyway), and Finch rewarding Root's return by locking her back into his personal-jail...which I actually thought was kind of entertaining. I suppose with Carter gone that Root will remain a more active participant going forward, but I'm concerned about what sort of arc they're taking her character in, too.
Shaw and Fusco remain the high-points of the show, as they have for some time now. For being usually portrayed as the comic relief "mascot" of the group, Fusco is surprisingly kickass at times.