Overall, I have to say that I'm very satisfied with the season finale and feel that it was by far the best episode of the season...even with the huge cliffhanger at the end (which was oddly similar to another LOST finale).
I loved the flashbacks and flashforwards that make the series what it is, but I was not really a fan of the time travel crap. I hope it's all sorted out by next season so we can just have a path toward resolution.
I like how we got to see flashbacks with how Jacob wove into the lives of the various characters (and wonder if he had something to do with everyone that's been to the island...or just with special people).
And I loved seeing Rose and Bernard again. <3