Wow... so many emotions... this book left me feeling a bit depressed... it's not a happy book. One thing goes wrong after the other, give them a break Sanderson! 
 While in the first book we had a clear and straightforward plot (take down the Final Empire), The Well of Ascension starts a bit blurry, you don't know where the plot is going, only that you have armies gathering against Luthadel and chaos while people try to adapt to the new government. 
 We also have a lot of little mysteries that accompany the plot but you don't know how it'll fit all together. There's a mistborn sparring with Vin at night who hears voices, a strange thumping Vin hears and gets stronger throughout the book, mist that kills and stays during the day, an army of kolossos who nobody knows how to control, a kandra who doesn't talk about his race, a written passage Sazed finds written in metal by the prophet who announced the Hero of Ages a thousand years ago, a figure made of mist that follows Vin, among others. You just go with the flow of the story until pieces start fitting each other (in a surprising way). 
 There's a lot more of Vin and Elend's relationship, their insecurities about each other and about themselves. While Elend tries to be a good king while maintaining his idealism, Vin tries to come to terms with whom she is and how she fits in the new society and with Elend. I was a bit frustrated with Vin, there's is even a sort of love triangle which is something I hate. The crew has changed since the first book and we get to know more about them. What I still feel is missing is Vin having a female friend, I hoped one of the new characters would be this role but it wasn't enough. We have a lot of boys and men around her and, while it's not a bad thing, I think she really needs a girl to talk to... about girl problems. 
 Anyways, it was an exciting second book and I'm really happy I already have the third one because otherwise the wait would have killed me. I'm anticipating a book hangover when I finish this series...