Chuck is awesome. I like Fringe, but it's not as fun as Chuck. Chuck fills that void that Entourage used to when it was actually watchable. It's light and brisk and fun.
I also give the writers credit, because it walks a fine line and tries to strike a delicate balance - and pulls it off. That does take a degree of skill.
Chuck is good times.
EDIT: Also has the most likeable cast of characters on television. The main character is arguably the lamest one! Jeffster 4 L1F3!