I love it. It's quite refreshing to have just a good hour action-comedy to break up all the serious shows. I mean, I love Heroes, 24, Prison Break, LOST, Smallville (not so much the two most recent seasons), etc. but Chuck is a cool respite from all that drama.
Supernatural does this to an extent also, except it's a little more on the serious side, but every once in a while, you'll get a goofy episode where you can tell they had so much fun making it.