I loved the season finale because it brought back memories of why I started loving the show in the first place. all the little glimpses of the past and the comedic parts with Morgan really showed that the writers didn't forget how to write a great script! like many others I fell in love with Sarah the first time she walked into the buy more ( Yvonne is sooo stunning, gotta love her).
Because I started watching chuck when it was near the end of the third season, I just went though the available episodes within a couple days. the show kept me up till 5-6 am because the plot and amazingness of this show were perfect. like many others I was constantly on edge waiting for Chuck and Sarah to get together...and until season 3 episode 12, which was probably the best episode in my opinion, the writers kept tempting our minds to think that its finally gonna happen. anyways getting back to the subject of the finale, at the end of the first half where Sarah says bye to Chuck I finally had that feeling I had all the way through to s03e12. The feeling that you must find out what happens next and see how they get back together!
Throughout the last hour of my favourite show, they just kept stalling that moment of reuniting the two of them and I was getting anxious because there was like 5 min left and its still not happening :( even though Chuck and Sarah are kissing in the final scene...and even though there were signs that Sarah was remembering things from the past...it still didn't cut it, and I was deeply disappointed. yes we can probably guess that in time Sarah will remember her past with Chuck, and that they will live happily ever after...but since we didn't get to see it ourselves, I feel as though @tvnut77 said it best stating we've been left unsatisfied.
I will definitely miss this show very much, and am more than likely to watch the five seasons over again some time in the future...but I will always miss the missions and comedy that the cast of Chuck enlightened us with for the five seasons of this great show.