Not an extensive review, but as both the Jesse and Kendra characters/actors are being slammed pretty badly here, I decided to post only to say that my opinion is VERY different. In fact, I found this site by searching for the actress' name who played Kendra, since I thought she was so interesting. Okay, and sexy as hell, too. I, for one, am looking forward to seeing her back. I hadn't watched Numbers, so didn't know her from that, so not sure if that made a difference. But I loved her.
And given that the series is in its fourth season, I thought they did just fine in creating the Jesse story arc, along with the casting of the actor. When I fell in love with this show my biggest fear was that they wouldn't be able to sustain it. The Jesse subplot has given extra layers to the show, and Colby is very good. Our whole family is still loving every episode. Though now about to go into withdrawals as we've caught up with them all!