CJack didn't have a good game but it baffles me how people go nuts in their hatred of him.
On a screen, the WR has very little to do besides present a quick target to the QB. Unless he did something pre-snap that I didn't notice, I'm not sure what he could have done different to make that play a success.
Assuming you are talking about the interception. If so, it wasn't a hot throw. Cassel took a normal drop and threw downfield. The DB squatted on the route and CJack turned it inside and upfield. I don't know if that was the right read or not, but I wouldn't make the assumption that CJack was supposed to stop with a DB sitting on the spot. About the only reasonable thing I can think of is that CJack didn't have a route option and should have stopped regardless. In that case, Cassel should have looked elsewhere because that spot was covered.
The other thing I've heard from others is that CJack should have read blitz. That is silly since he has to keep his focus on the coverage in front of him. It is up to Cassel to read the pre-snap defense and call route adjustments if needed.
Obviously Cassel thought he did the right thing. Why do you think Belichick always talks about watching the tape before making post-game comments? Cassel shouldn't have called out CJack on the field. CJack shouldn't have responded on the field. Cassel shouldn't have talked about the situation post-game, except for the standard "some things were better than others" company line. While he didn't specifically say it, Cassel was obviously throwing CJack under the bus for the interception. Not a shiny moment of leadership there.
CJack didn't have a good game. He didn't have the opportunity to excel because of poor QB play. CJack could have done more with the throws that came his way, but lets be real about how much he had to work with.