Maybe the best season opener so far for 2008. It really had all the things I like about the show, and served as a great "coda" for the series.
My favorite character, by far, is Casey. He had some awesome moments in this episode. I like his fondness for Chuck, and the fact its not overdone. I also love that we will never know if Casey would have actually followed his orders and killed Chuck. Also? Love Casey's apartment with its secret spy stuff.
The only thing I don't like about the show is the Buy More silliness (especially when it doesn't involve Chuck himself). The cage match battle wasn't really funny, and Morgan continues to grate. The inclusion of the Buy More staff in the opening credits has me fearful. I was hoping for LESS of that element, certainly not MORE.
But all the stuff with his sister and Captain Awesome> awesome. That stuff really works for the show. I love Chuck's relationship with his sister. It's 100x more interesting than Morgan. And I love his interplay with Awesome. I hope they live together for the rest of the season.
Oh, and Chuck's first date with Sarah was very cute.