I say this as a big fan of 'Chuck': the show has jumped the shark. There are several reasons for this, but the big one is that once Chuck and Sarah got together there seemed nowhere else for the show to go.
The show could create artificial barriers such as the Intersect malfunctioning or Morgan trying to become a spy, but in the end the show had two goals set in the first season: 1. Chuck's search for purpose in life and 2. Chuck's evolving relationship with Sarah. Both of these issues were resolved halfway through the third season before the six-episode extension. And now, it's been renewed for a fourth season.
Despite this negativity, I'm all for this renewal, if only to see how the writers essentially dig themselves out of the hole they're in. If 'Heroes' can get a five-year ride off an amazing first season (and subsequent crappy ones), then 'Chuck' is ahead of the curve.
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