Sure, it's silly much of the time, but it always brought a smile to my face. I liked that it was a show about basically good people making sacrifices for their friends/family/country. I liked that it wasn't cynical. Mostly, it was simply a fun show that never took itself too seriously, but did manage to produce some quality drama and interesting stories while providing a lot of humor and fun spy stuff. And I thought the show was very well written and acted. It's not surprising that Yvonne Strahovski has basically been working non-stop since Chuck closed shop. I thought she was great in the most recent season of "24".
Anyway, I have a soft spot in my heart for "Chuck." I still watch a few episodes each week, and I still get a kick out of it.