Just finished "The Final Empire", and I have mixed feelings about it. Overall I thought it was a pretty good book and I probably have most of the same compliments/complaints as most people. I've read "The Way of Kings", but none of Brandon Sanderson's other works (I'm currently re-reading WoT in order to get to the newer books), so while I have detected an 'evolution' of sorts in Sanderson's writing I don't know if my next statement will generalize towards his other books or not.....
I felt like for "The Final Empire" it almost has a Young Adult style to it. Does anyone else feel that way? It's not intended as a complaint really, because I still thought the book was pretty good. Its hard to put into words, but despite some of the gory-ish scenes his writing felt kind of ... simple to me. I felt slightly different reading "The Way of Kings", but for me "The Final Empire" lacked some of the subtleties and complexities found in other fantasy novels. But don't get me wrong, I still enjoyed it! It was a first time read for me and I finished it in about 2 days, so obviously something had hooked me. 
Yeah I must say I am mixed now I've finished. The ending was a bit... eck... and the characters were a bit... well... eck... too. I mean, when I compare it to say; Night Angel Trilogy - the characters just don't compare, Painted Man - No where near as well paced, the fight scenes were so, so vivid too.
Things I did like; The writing style was fantastic, the 'image' of the Lord Ruler was great, the magic system, the explanation of the magic system, the contrast of the levels of nobility, etc. I think it was a very good story that was perhaps told in a rather 'weak' way... saying that, Brandon Sanderson was a relatively new author when he wrote this book and from what I have heard his work only gets better.
I will certainly finish the series, but I'm gonna give it 5-6 months... I can't take another dose of Vin paranoia right now

I would be a Lurcher I think...